Anti Virus is the most important software for your PC, as it saves your PC from Virus attacks, and I am sure that you really are concerned about it, that is why you end up purchasing costly Anti Virus Applications for you PC. If you are not that geek you can easily be Fooled by your local tech support guy who sold you the PC.
Now let me tell you that you really don’t need heavy and costly Anti Virus until you do heavy Illegal Download from underground sites, or watch a lot of porn. There are many other Anti Virus which are available for free and are very light to use.
Here is a list of Anti Virus that I have found effective.
I tried AVG last year and it worked so well. It is so far the lightest Anti Virus I have ever used so far. AVG Free Edition is a classic, one of the longest running free antivirus packages available for Windows XP/2000/NT/ME/98. Installing only 30Mb of files and 4 running processes.
In addition to standard scanning modes, Avast Home Edition also provides scans on bootup. This can greatly increase the chance of removing stubborn infectors, particularly those that use resuscitators to thwart removal attempts. Supports workstation only versions of Windows 95/98/Me, 2000, XP, and Vista and Windows 7.
For Mac users, this may not be a significant limitation given that there are far fewer malware impacting the Mac OS. PC Tools iAntivirus guards against Mac malware, including viruses, worms, trojans, spyware and adware. Unlike some Mac antivirus software.
If you’re looking for free Mac antivirus software, ClamXav is certainly a virus scanner worth trying. ClamXav is based on the open source ClamAV virus scanner. Popular among open source fans, in practice ClamAV lags behind the detection capabilities of commercial antivirus software.
So these are the Free Anti Virus Softwares which can be used and you can save some money.