I formatted and reinstalled XP Pro on this PC. Connected it to the internet using firefox 3. And within several hours my PC performance has decreased exponentially when I do not have any other programs or processes running that are not required for windows to run properly. Mostly core processes. I thought it might be spyware or malware from the internet but After I installed Norton Internet Security 2008 and Spybot 3. And ran scans revealing nothing. I cannot figure out how to fix these issues.
The computer is used by children, they play allot of flash games, myspace, and youtube. if that provides any extra info.

PC Specs as follows (yes it dose require more RAM I understand)
2.6Ghz P4 Single Core Processor
128Mb PC3200 RAM
Videocard Unknown
Mobo Unknown.

40Gb HDD

Thats bout all teh specs needed. Running Xp Pro SP2