Which antivirus is best to use for your computer?

for XP, Avast and for Win 7, Microsoft Security Esencial.

I use Quick Heal Internet Security 2013. It always Keep My System Clean from Virus, Malware, Trojans Spyware. It is first Cloud Based Antivirus & I used it from 1 years. I never Face any Virus Attack Since I use it.

I can't say which anti-virus program is best, but I like Norton 360.

We use 360 security

I use avast. It is not heavy in the memory.

I use Windows Security Essentials. It is a lightweight program for your computer, it is automatically updated and free. Protects your computer every time and can perform scans your pc preprogrammed.

Windows Security Essentials, it is 100% free, auto-updated......coming from Microsoft for all its licensed users. Found it reliable.

avast Antivirus is best
I have registered Avast antivirus
do you need it key, I will provide you it Free of cost,
just boost my profile, its deal