If your processor were fried you would'nt be using the system.  What sort of software are you running?  What exact system do you have?  Specs?  Definatly how much Ram and what type?  We need to have these answered to better answer your question.

Could be a power-related problem such as a bad UPS or surge, or even power supply.  Could also be bad memory or even a CPU.

The system could use a bare/clean install of it's OS with all cards, external devices, and even unneeded drives disconnected  to determine the problem.

Well, this is not really a dell anymore.

It has a Antec 430Watt power supply

40GB 5400rpm HDD

448MB 133MHz SD RAM

Celeron 800MHz 100FSB

Original Dell sound card PCI Sound Blaster

48x CD Rom

GForce 4 MX440 64MB Video card

Wireless mouse

Keyboard

New Motherboard

 

I figured a fried processor wouldn't work becasue I have one of those, but the processor is the only think I can think of sence reformatting and Reinstalling XP Home isn't helping.

 

Thanks.