nice advice pal i think firewalls like zonealarm and anti-virus like norton 2002 are my choice .both of them are effective to protect the disk from virus .well softwares like zonealarm (freeware) even protect computers from hackers and intruders.anywasy i will suggest one must have backup of their sensitive files by softwares like back up gennie.ya it will help a lot if somehow you are affected by a virus. that's all