Good antivirus?

my parents don't want to pay for an antivirus, but we need one badly. The computer's starting to slow down and get annoying popups that shouldn't be there. I see the warning flags but don't know what to do. Are there any free trials out there that anyone could recommend?

Good antivirus?bmw

AVG to me is the best choice for an AntiVirus.

Good antivirus?free adware remover

http://www.grisoft.com/doc/289/lng/us/tp...

That is a pretty reliable free Virus Scanner
These programs are free..

choose an Anti-virus

AVG....

http://free.grisoft.com/freeweb.php

Or AVAST....

http://www.avast.com/eng/avast_4_home.ht...

Or a-squared.....

http://www.emsisoft.com/en/software/free...

Or Computer Associates.....

http://www.my-etrust.com/microsoft/

For Trojans try these ( free to try),

http://www.ewido.net/en/

Or

http://www.misec.net/trojanhunter/

Or

http://www.agnitum.com/products/tauscan/...

And always scan once a week with these free and trusted scanners as well if you go to gaming sites and porn and etc.

http://housecall.trendmicro.com/

http://www.webroot.com/land/freescan.php