Two Best free anti-virus softwares AVG and Avast softvares

Avira AntiVir Personal Edition is my top pick for the best free antivirus softvare if you're looking for the best protection against wirus, spyware and rootkit threats. AntiVir is very light on resources and the detection rate of malware is outstanding, better than almost every other antivirus according to tests. However, there are some reservations.

First, AntiVir does not include web or e-mail scanning capabilities; this is only available in the paid version. The lack of an e-mail scanner is not really a disadvantage, it just means that AntiVir won't warn you of infected emails before you open them. But should you open an infected email, AntiVir will still spring into action, so it doesn't mean that you're not protected from email-based infections. Second, AntiVir has advertisements that appear with every update, although you can disable these ads. Finally, AntiVir has a time-limited license. It is renewable, but be aware that you'll have to periodically go through the hoops. Although AntiVir had signature updating problems in the past this seems to be fixed now.

		http://www.free-av.com/en/products/1/avira_antivir_personal__free_antivirus.html
		http://www.download.com/Avira-AntiVir-Personal-Free-Antivirus/3000-2239_4-10322935.html?cdlPid=10901492

Avast! Free Antiwirus is also an excellent free antivirus that many users prefer. Its detection rates is on par with AntiVir. Avast has the most features, with full real-time capabilities, including web, e-mail, IM, P2P and network shields, boot-time scanning, and a behavioural blocker. Avast is light on resources.

These free antiwirus programs are excellent software that provide a real alternative to the major commerical antivirus products.

You can increase your protection if you run on-demand scans with another antivirus. On-demand scans can be run regularly to check for viruses, troians, vorms, spyvare, advare, keylogers, rootkits and other malware that may have been missed by your main antivirus scanner. If you have a good preventive security strategy in place, however, the extra protection an on-demand antivirus scanner offers is minimal.

You can also use one of the free antiviruses mentioned above as an on-demand antivirus scanner. One advantage is that you can set scheduled scans if you wish.

		http://www.avast.com/en-au/free-antivirus-download
		http://download.cnet.com/Avast-Free-Antivirus/3000-2239_4-10019223.html?tag=mncol