Internet security? please help.?

I have windows xp and recently I have been getting these message that my computer is infected with spyware,virus, and trojans. I have removed them and my security says there are no infections on my computer. I have downloaded Mcaffee, Norton antivirus, spyware, adware and anything you can think of but I still keep getting this message that my computer is infected. Righ now i only have mcAfee. what should I do?

Internet security? please help.?photoshop

Restart your computer in safe mode ( pressing F8 while booting up select restart in safe mode with networking), the run your antivirus software. Here is a list softwares so you can create your own security suite based on freewares, that not only will secure your computer but also boost its performance. You must uninstall macfee befor doing this.

Anti virus:

AVG free edition.

http://www.download.com/avg-anti-virus.....

Anti spyware: You can run more than one.

Ad-aware

http://www.download.com/ad-aware-2007/.....

Spybot S%26D

http://www.download.com/spybot-search-.....

Firewall:

Zonealarm

http://www.download.com/zonealarm-fire.....

Registry cleaner:

advanced windows care personal

http://www.download.com/advanced-windo.....

Spywareblaster

http://www.download.com/spywareblaster.....