5 Best Free Windows Antivirus Which Does Not Make PC Slow

by Abhishek Bhatnagar on May 23, 2012


There are times when most of the user using windows some time or the other faced windows running slow because the heavy resource hungry antivirus which is running using a lot of CPU not only when it’s running the full computer scan, quick file scan or even when the antivirus is just shown in the system in its idle state.

Best Free Windows Antivirus

This scenario is still ok for computers with good amount of RAM but for windows computer which are low on RAM memory like if they have 1Gb or less then antivirus really make a difference as in that case it can really degrade the system performance for you and make you wonder what it causing your windows computer run so slow.

Below are some good antivirus and their respective features, you can choose to install any of these

Microsoft Security Essentials

It is a new, free consumer anti-malware solution and spyware protection for your computer. It helps protect against viruses, spyware, and other malicious software. The tool offers free spyware protection, and it’s available as a no-cost download for Windows XP SP2 and higher, Windows Vista, and Windows 7.


  • Light on system resources
  • Around 9 megabytes in Size for download
  • Works on all versions of windows

Download Microsoft Security Essentials

Panda Cloud Antivirus Free Edition

It comes in two editions one free and other one paid. It provides real-time protection against all types of viruses and Automatic & transparent upgrades of new engine and program versions. It does provide URL and Web filtering of malicious, drive-by exploits and phishing sites.


  • Ultra light on system resources
  • Around 10 Megabytes
  • Real Time Protection

Download Panda Cloud Antivirus Free Edition

Avira Personal Free Edition [ Editor Pick ]

This entry-level antivirus eliminates many forms of malware, including worms, rootkits and costly dialers. It has system scanner prevents infection from viruses, worms and Trojans. Its web Protection steers you away from malicious websites.


  • Very Very Light on system resources
  • Around 94 Megabytes but worth downloading
  • Express Installation sets up your security system for you
  • Protects from USB Flash Drive Viruses

Download Avira Personal Free Edition

Comodo Antivirus Free Edition

It Cleans your PC of malware through periodic scans that are scheduled at your convenience in real-time, and are continually updated with the very newest virus definitions. You can Easily Adjust Your Security Level. To change your current security level, simply adjust the Antivirus to reflect your security preferences at any given time. It compatible with Windows XP, Vista and 7. 32 and 64 bit versions available.


  • PREVENT all Spyware, Viruses, Malware and Trojans
  • NO MORE suspicious hidden files
  • PROTECT all kinds of devices
  • FAST scanning

Download Comodo Antivirus Free Edition

Avast Antivirus Free Home Edition

As per community reviews it is the best Free Antivirus which represents the best free antivirus protection currently available on the market. This edition is FREE OF CHARGE for non-commercial home use which has the highest number of security and protective features.


  • Anti-spyware built-in
  • Web Shield
  • Anti-rootkit built-in
  • Automatic updates
  • Strong self-protection
  • Virus Chest
  • Antivirus kernel
  • System integration

Download Avast Antivirus Free Home Edition

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{ 3 comments… read them below or add one }

Gloria Clay May 24, 2012 at 12:33 am

Man oh Man! ! ! I downloaded the Microsoft Security Essential and WOW ! ! ! What a DIFFERENCE ! ! ! I LOVE you all ! ! I had had McAfee and THAT was slowing down my PC to a crawl ! Grrrrr ! ! Then, I went back to AVG, and that was better. BUT, with the help from your site, I now have the perfect program for security and speed. THANK YOU, THANK YOU AND YOU GUYS AND GALS ARE AWESOME. Keep up the great work and keep me posted for more GREAT info. All the best and THANKS, AGAIN.

cumaar July 20, 2012 at 9:05 pm

It’s a good advice for the net users and this site is really useful for the people like me. Thank you.

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