Open the case and clean out the 'dust bunnies'. The CPU will throttle back
if it starts to overheat. (Not sure how much your system is slowing down -
it's subjective.)

"The Pete" wrote in message
oups.com...
My computer is approximately 2 months old and now has just recently
started to slow down after 3-4 hrs of use after each bootup. I have
scanned for viruses, malware/spyware, uninstalled unecessary programs,
defragmentized the hard drive, run diskcheck and cleared cookies and
temporary files from Internet Explorer. After a few hrs the system
slows down substantially thus making it difficult to browse the net
and switch inbetween programs.

I am currently running: Windows XP SP2 (with all updates), Pentium
Core Duo 2.4ghz, 2 Gigs of Ram, Norton Internet Security.

Any thoughts?