|I am wondering how old the computer is.|
Not that age is a true factor but there was a rash of bad capacitors a few years ago. If the caps are bulging or leaking the system will begin to fail.
You may want to look up and see if your system is listed as one that has had this problem.
If you do decide to do a clean install....be sure to get a free program to back up all your drivers first...put them on cd or floppy. Also copy and past all you registration and serial numbers to a text file.....floppy or cd....
Also " siw a free program will work" compare and right down the key to reinstall.
Depending on how the os was installed the system may be using a key different than the one on the coa sticker.
The reason I mentioned caps is, I have a system that took 36 hours to format a 40
gig hard drive and 15 hours to install xp. It takes 18 minutes to boot up. Once it boots it still runs ok...but all I use it for is to test sata, ide and scsi drives.
It has two bad caps.....and will one day fail completely..... LOL!
If not the caps I would look at the power supply, hd and memory should a clean install not correct the problem.
Post back with an update.....