install:-
1]AVG 7 Free Edition,it's a very effective and light AV
*free.grisoft.com/freeweb.php/doc/2/
2]Spyware Guard,a real time spyware/malware monitoring software
*www.javacoolsoftware.com/spywareguard.html
3]Ad Aware,very good spyware/trojan/adware remover
*www.lavasoftusa.com/software/adaware/
4]SpyBot SnD,need i say any more
*www.safer-networking.org/en/index.html
5]RegCleaner,a free alternative to RegSupreme,very good at cleaning registry.
*www.jv16.org/
6]WebRoot Spysweeper
*www.webroot.com/products/spysweeper?rc=266&ac=627