|I've copied the following from your other post becuase it will probably be deleted:|
"the ram is 1gb and ibm lenove p4 3ghz both the hdd are ide and they are connected in differenct cables"
You really need to do better on the specs. What is the model/model number of your "ibm lenove"? We need more info about your P4, like what FSB speed? How about the RAM - is it DDR or DDR2 & what speed? Do you have a video card or are you using onboard video? How many total IDE devices do you have? If it's three, the 40GB should be all alone on the primary & the CD/DVD & 80GB should be on the 2ndary. Also, I doubt the 40GB drive is a fast drive.
After you reinstalled Windows, did you install the latest drivers, especially the motherboard chipset drivers? Did you install SP3 & all the rest of the Windows updates? Did you tweak XP for optimal performance? What about additional software? Are you running a lightweight anti-virus program such as AVAST, AVG, or Microsoft Security Essentials? The wrong security suite can suck the life out of a system.