What is the best software to use to get rid of Computer Viruses once they are on your Computer?

My antivirus software expired and now I think I have a virus.. What software is the best to use to get rid of these trojan,adware,spyware?

on my computer i had avast anti virus and it found two viruses

Avira AntiVir free edition updates daily, low on resources, quick scan times, detects 94% of viruses, superantispyware free edition, malwarebytes free edition, With these you should be fairly well protected., Good luck,

i use avast anti-virus. it's free and automatically updates itself. it runs in the background all the time. it has worked for me for years. avg is pretty good too, and free

A Windows installer CD to reinstall Windows.

Then a limited user account to keep off future infections.

Or a Linux installer CD to install Linux over Windows.