Avast Antivirus

Avast is a verry good antivirus in my opinion.
I use it on my own computer .
avast! antivirus

represents a multi-award winning solution to virus protection, with anti-spyware and anti-rootkit software built in for added security. It is available free for non-commercial, home use and with its fast, automatic updates avast! antivirus is already being used by more than 50 million users worldwide to provide continuous protection against all forms of malicious software (malware).

TRIAL

I use BitDefender 10+ and it's prety good. the only bad thing is that it need some considerable resources( it likes eating Kernel Memory). anyway the Commit Charge is somewhere at 670M with 42 processes but it's appearing the lagg effect when running games. but in main it's a good antivirus: malware protection, anty-spyware, rootkit check real time system check and others.