General PC help
I cannot stress enough the importance of a firewall program, spyware and adware blockers and a general security suite. I use Trend Micro's Internet Security Suite 2007 but have also used AVG antivirus that is free. Just google and you will find some very good ones. I would also suggest going to CNET.com and the section they have on programs for internet security to find free and trial versions before you spend your hard earned money on one.
If your interested I have some good articles at my CP Page at Associated Content with some more information about spyware, adware and viruses.
http://www.associatedcontent.com/user/1142/jeff_gedgaud.html