Plz suggest best anti-virus full version and its link ?my expolrer andyahoo messanger is also not wo

my computer is running mozilla firefox and windows 2000

Plz suggest best anti-virus full version and its link ?my expolrer andyahoo messanger is also not working.?hijack this

Free Antivirus

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

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

http://www.activevirusshield.com/antivir...

http://www.free-av.com/

http://www.bitdefender.com/PRODUCT-14-en...

http://www.clamwin.com/

Plz suggest best anti-virus full version and its link ?my expolrer andyahoo messanger is also not working.?liveupdate

avg, kapersky, and a few others are available...go to http://www.download.com and look em up
Kaspersky - www.kaspersky.com

Nod32 - www.eset.com

my top two choices
http://www.symantec.com/norton360/