Ok so I decided to skip the Everest part and just went and looked up the info on the Celeron 420 CPU thats currently in the PC. It's a single core, 1.6 GHz, 35W, 65nm, LGA775 processor. Now that I know it's a 775 socket type, I assume I can find something fairly easy to replace it with. Now my next question... The Celeron 420 has a FSB of 800 MHz. Should I stick to that or can I go higher? I'm also gonna check to see what kind of PSU it has, and whether or not it will be sufficient enough to power a better CPU.
**Edit**
I just realized that the 420 uses the 65nm Lithography, and is 35W. Can I even use a processor that's 45nm and 65W? I'm still new to this CPU upgrading thing.
Also, would I have to purchase a new Operating System if I upgrade the CPU?