AVG Free edition seems to be excellent. Note that multiple ANTI-VIRUS programs will often conflict with each other. Multiple ANTI-SPYWARE programs are fine. Spybot:Search and Destroy, Malware Fighter, Ad-Aware, and Advanced System Care all have free versions for anti-spyware. Also, you should have a FIREWALL - Zone Alarm has a free 2-way version. Good Luck!!
i had avg but i think it's not so good :/ because i uninstalled it and installed MICROSOFT security one, it found some viruses avg didn't fine..but i downloaded AVG PC TUNE UP, it's pretty awesome ! Thanks for answering :)
AVG OR NOD32 and if you need any more info tell me
AVG Free Edition is excellent. Avast is supposed to be goog too.
Avast, it's awesome.