Kaspersky Total Security 2021 (Version 21.3.10.391) Kaspersky Total Security 2021, specifically version 21.3.10.391
, is a legacy comprehensive security suite designed to protect Windows-based PCs from a wide array of digital threats. While Kaspersky has transitioned its main product line to new tiers (Standard, Plus, and Premium), this specific 2021 build remains a notable version for users on older operating systems or those with existing legacy licenses. Quick Facts Release Date:
The 21.3.10.391 version was widely deployed around March to June 2021. Operating System Support:
Compatible with Windows 7 (SP1+), 8, 8.1, 10, and Windows 11. Hardware Requirements:
Requires a 1 GHz processor, 1–2 GB of RAM, and approximately 1.5 GB of free disk space. Update Status: Legacy products like this version continue to receive virus database updates and standard technical support from Core Security Features Does KIS 21.3.10.391 Patch (C) rolling-out? [MERGED]
I can create a full guide on Kaspersky Total Security 2021 (version 21.3.10.391) for Windows — installation, setup, configuration, feature walk-through, performance/tuning, troubleshooting, and removal. I'll assume you want a comprehensive, step-by-step manual including screenshots locations (text descriptions), recommended settings for privacy/security, common issues and fixes, and safe uninstall. Proceeding with that assumption.
Do you want:
Pick 1 or 2. If you prefer 2, I’ll produce the full structured guide now.
Note: The string appears to be truncated at "W...", which almost certainly stands for Windows.
If you are installing version 21.3.10.391 on an old machine, these are the requirements:
| Component | Minimum Spec | | :--- | :--- | | OS | Windows 7 SP1 (with ESU support), Windows 8.1, Windows 10 (20H2) | | RAM | 1 GB (32-bit) / 2 GB (64-bit) | | Disk Space | 1.5 GB free | | Processor | 1 GHz | | Screen | 1024 x 768 (for the GUI to render properly) |
Warning for modern users: This version will install on Windows 11, but due to Microsoft's security changes (Virtualization-Based Security, Hypervisor-protected Code Integrity), you may experience performance glitches or a warning that the software is "Not fully compatible."
If you are currently running this version, ask yourself:
Stay on 21.3.10.391 if:
Upgrade immediately if:
Q: Can I still activate Kaspersky Total Security 2021 in 2026? A: Possibly, if you have an unused activation code manufactured before 2022. However, Kaspersky's activation servers usually force-upgrade you to the latest version automatically during activation.
Q: Is 21.3.10.391 compatible with Windows 11? A: Not officially. It may install, but you risk system instability and "kernel security check failures."
Q: Does this version include a VPN? A: Yes, a limited free VPN (200MB/day) called Kaspersky Secure Connection was included.
Q: How does it compare to Windows Defender (in 2025)? A: The core engine of 21.3.10.391 is still superior in offline detection (without internet), whereas modern Windows Defender relies heavily on cloud lookups. However, Defender is safer due to regular Microsoft patches.
Disclaimer: This article is for informational and historical purposes. Always download security software from the official publisher (Kaspersky Lab). Using outdated software may violate your corporate security policy. Kaspersky Total Security 2021 21.3.10.391 for W...
Kaspersky Total Security 2021 (Build 21.3.10.391) for Windows: An Informative Overview
Kaspersky Total Security 2021, specifically build 21.3.10.391, represents a significant iteration of Kaspersky Lab’s flagship security suite for Windows users. Released during a period of heightened digital dependency, this version aimed to provide a holistic defense mechanism against the evolving landscape of cyber threats.
Here is an informative breakdown of the key features, improvements, and context surrounding this specific release.
Build 21.3.10.391 of Kaspersky Total Security 2021 represents a polished, feature‑rich consumer security suite suitable for families and users who want a consolidated protection dashboard. Its strengths are broad functionality and strong detection; its tradeoffs are complexity and higher system/resource impact. Keep the product and Windows up to date, monitor vendor patch notes for compatibility fixes, and contact support if staged patch distribution or update failures occur.
(Date: March 23, 2026)
It seems you're looking for a guide or information regarding Kaspersky Total Security version 21.3.10.391. This specific version was a major release for the 2021 product line.
Since then, Kaspersky has transitioned its product lineup from "Total Security" to a new tiered subscription model (Standard, Plus, and Premium). However, if you are still using or installing version 21.3.10.391, here is a quick guide to its essential functions: 1. Installation & Version Check
Installation: You can typically download the installer from the Kaspersky Support Portal. If you have an existing license, it will automatically activate the features.
Verification: To confirm you are on version 21.3.10.391, hover your mouse over the Kaspersky icon in the Windows system tray. A pop-up will display the full version number. 2. Core Protection Features
Kaspersky Total Security is an "enhanced" version of their Internet Security suite. Key features included in this build are:
Safe Money: Automatically opens a protected browser when you visit banking or shopping sites.
Privacy Protection: Blocks unauthorized access to your webcam and prevents websites from tracking your browsing habits.
Password Manager: A built-in tool to store and sync passwords across devices.
File Encryption & Shredder: Allows you to create "vaults" for sensitive files and permanently delete data so it cannot be recovered. 3. Managing the Software
Running a Scan: Open the main dashboard and select Scan. It is recommended to run a "Full Scan" immediately after installation to ensure your system is clean.
Disabling Protection: If you need to install a trusted program that the antivirus is blocking, right-click the icon in the system tray and select Pause protection. You can choose to pause for a specific duration or until you manually restart it. 4. Safety and Reliability
Kaspersky products consistently receive top marks from independent labs like AV-TEST and AV-Comparatives, often showing protection rates near 99.9%.
Note for US Users: Please be aware that the US Department of Commerce has recently issued restrictions on the sale and distribution of Kaspersky software in the United States. If you are located in the US, you may find that updates are no longer available or the software has been transitioned to a different provider (like UltraAV).
This paper provides an overview of Kaspersky Total Security 2021 (Version 21.3.10.391), focusing on its features, system requirements, and the specific improvements introduced in this release for Windows users. Overview: Kaspersky Total Security 2021 (21.3.10.391) Kaspersky Total Security 2021 (Version 21
Kaspersky Total Security 2021 is a high-tier security suite designed to provide comprehensive protection against a wide range of digital threats. Version 21.3.10.391 (also known as MR3) is a stable release that focuses on enhancing web security, streamlining technical support, and improving the overall user interface. 1. Key Features and Capabilities
Multi-Layered Protection: Combines traditional signature-based detection with advanced behavioral heuristics to block both known malware and zero-day threats.
Web-Antivirus Enhancements: In version 21.3.10.391, notification texts for phishing and potentially dangerous sites were improved. If HTTPS traffic scanning is disabled, protection is maintained via the Kaspersky Protection browser extension. Privacy & Identity Tools:
Safe Money: A hardened browser for secure online banking and shopping.
VPN Secure Connection: Encrypts data and masks IP addresses (limited daily data unless upgraded).
Password Manager: Stores and syncs credentials securely across devices.
Webcam Protection: Prevents unauthorized access to the device's camera.
Family Safety: Includes a full version of Kaspersky Safe Kids, offering parental controls such as screen time limits, social media monitoring, and GPS tracking.
Performance Optimization: Features a Gaming Mode that pauses notifications and heavy scans to ensure maximum system performance during play. 2. Technical Specifications & Requirements
Version 21.3.10.391 is optimized for performance on modern Windows environments but remains compatible with older systems. Minimum Requirement Operating System Windows 7 (SP0 or later), 8, 8.1, 10, and 11 CPU 1 GHz or higher (SSE2 instruction set support required) RAM 1 GB (for 32-bit OS) or 2 GB (for 64-bit OS) Free Disk Space 1500 MB (1.5 GB) Other
Internet connection for activation and updates; .NET Framework 4.0+ 3. Notable Improvements in Version 21.3.10.391
The MR3 (Maintenance Release 3) update brought specific functional refinements: Kaspersky Total Security 20 System Requirements
Here is the most likely full file name based on Kaspersky’s naming convention:
Kaspersky Total Security 2021 21.3.10.391 for Windows
Or, as it might appear in an installer file:
kts21.3.10.391en.exe
(where "en" could be replaced by another language code, e.g.,en-US,de,fr,ru)
If you need a full descriptive text for documentation or a download link, here’s an example:
"Kaspersky Total Security 2021 (version 21.3.10.391) for Windows – comprehensive multi-device security including antivirus, VPN, password manager, and parental controls."
Kaspersky Total Security 2021 (version 21.3.10.391) is a comprehensive security suite for Windows designed to protect against malware, ransomware, and identity theft Pick 1 or 2
. While still popular, Kaspersky has transitioned this product line into the newer Kaspersky Premium Core Security Features Antivirus Defense
: Continuous scanning for viruses, Trojans, rootkits, and spyware. Safe Money
: Opens a protected browser for secure online banking and shopping. Privacy Tools : Includes webcam protection ad blocker private browsing to prevent websites from tracking your activity. Performance Optimization : Features a to reduce lag and PC speed-up tools like junk file removal. Parental Controls
: Advanced tools to filter content and track a child's online usage. System Requirements
To run version 21.3.10.391 efficiently, your PC should meet these minimum standards: Operating System : Windows 11, 10, 8.1, 8, or 7 SP1+. : 1 GHz or higher (SSE2 support required). : 1 GB for 32-bit systems; 2 GB for 64-bit systems. Disk Space : At least 1500 MB of free space.
: Internet Explorer 11, or the latest versions of Chrome, Firefox, or Microsoft Edge. Installation Guide Kaspersky Premium Total Security
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Kaspersky Total Security 2021 (Version 21.3.10.391): Legacy Protection for Windows
Kaspersky Total Security 2021 (v21.3.10.391) was once the "gold standard" for home cybersecurity, offering a dense suite of tools beyond basic antivirus. While it has since been replaced by Kaspersky's newer "Standard, Plus, and Premium" tiers, this 2021 version remains functional for many existing users with access to updated virus databases. Core Features of Version 21.3.10.391
This specific build focused on three pillars: proactive detection, real-time protection, and instant neutralization. Kaspersky 2021 Review and Security Test vs Malware
Kaspersky Total Security 2021 (version 21.3.10.391) represents a comprehensive milestone in personal cybersecurity, offering an integrated suite designed to safeguard digital life across multiple fronts. While Kaspersky has since transitioned to a subscription-based model (e.g., Kaspersky Plus), version 21.3.10.391 remains a frequently cited and used iteration of their legacy "Total Security" flagship. Core Functionality and Comprehensive Protection
At its core, Kaspersky Total Security provides multi-layered defense against a wide array of threats:
Antivirus and Anti-Malware: It protects systems from viruses, ransomware, and other external menaces.
Web Protection: The suite guards against network attacks, phishing attempts, and spam.
Enhanced Tools: Unlike simpler antivirus versions, the "Total Security" tier includes additional user-friendly tools such as a remote management interface and advanced privacy features.
