your problem -- use this instructions
Hi. My name is Chuck.
I would first check if all your fans inside your computer works. Most importanly the one mounted on the m.p.u. (microprocessor). If this fans dies for a long time while the pc is running, then there could be the possibility of a burn up of the main part which mean -- look for a new computer if the replacement is almost the same price as new.
When you pass this test, I would suggest check the fixed disk drive. When I upgraded my Win 98se to XP, my fellow technician tells me it is better to format the fixed disk drive for the XP. This means that you have to collect all device information to get the drivers before installing the XP (home or professional). So you won't have to search the internet for them.
if after all this fails then check the compatibility of your fixed disk drive to the motherboard, most computer place should be able to tell you this but to be safe check with some other technician before buying. then go through all the steps again for installing the XP.
Chuck.