AVG can slow your computer down when it scans and that's the reason why i hate avg.....i don't trust it.

..well if you want to have the best antivirus...i would recommend Kaspersky Internet Security not the Kasperky Anti-Virus it's a hacker suggested anti-virus..

...anyway...if you want to have free anti-virus...you can have Avira...but it blocks all the autorun.inf ...^^..that's the disadvantage of Avira...