Upgrade from Pentium 3 to Pentium 4

Http://dell-driver.driveray.com/dell-drivers/r_10_1.shtml

I'm presuming it's starting to load windows 2000/XP/Vista when it reboots. Reason for this is Windows has a Hardware Interface file that it reads from during boot to perform certain functions, but because the CPU doesn't match what's in the hardware file, it errors. If you have the original install disc, start from that, and use the Repair function that shows when you go to actually install it. This will essentially rewrite all the files for windows without losing any data. Be careful though, as there are 2 times that a repair option comes available, and the first one will not work.

@ed tolentino

Hi Please provide me some details on whether your computer is gettign restarted when Operating Systems starts loading (Windows XP or something else) or it is getting restarted before displaying any screen.

If your system is gettign restarted after Operating System tried to load itself, then there is an issue with your operating system /device drives so you need to reconfigure your operating system.
If your system is getting restarted just after you power it on then do the following check
1) Restart your computer and press F1/F2/Del to enter into the BIOS (buttons will vary according to motherbards) and when you enter into the BIOS configuration settings please hang there on any option for atleast 10 minutes
--> If on this BIOS configuration also you are unable to keep your system running (restarts happening) then there must be issue with Hardware.

Please perform above activities and let me know about it

Companies like PowerLeap sell CPU upgrade modules that include the necessary adapter electronics and software to make next-generation CPUs and such work. Note that these are modules, not just CPU chips.

However, these upgrades tend to be fairly expensive and lack the same performance as on a platform that was designed for that CPU. Upgrading the motherboard, CPU and RAM together, or simply getting a new computer is usually easier and better.

What socket is the Pentium 3? Socket A. The sockets have to be compatible for example you can't upgrade a Dual Core for a Core 2 Duo because although the chipsets look the same the motherboard may not support the new instruction set. I had this problem recently as i wanted to upgrade my Intel Celeron D 3.02ghz to the Pentium Dual Core 1.8ghz and although the chips were identical and fitted perfectly in my mobo, the actual mobo i was using (foxconn) wouldnt work with it forcing me to buy an ASRock mobo and replace the entire system.