I got the computer fixed. I will explain how I did it.
It was not a Windows XP problem. It was not a hardware problem.
I looked in Device Manager, under IDE ATA/ATAPI Controllers, and clicked on Primary IDE Controller (the 2nd one, there are two with that name)
I clicked the Advanced Settings tab and found that it was set to PIO 0, instead of DMA. Thus, load times were extremely slow. This happened because a feature in my hard drive, called SMART, detected too many read/write errors which occured because of the low voltage. After so many errors were recorded in its cache, it changed DMA to PIO 0 to slow it down and reduce the number of errors.
I uninstalled the controller, then restarted. Windows created a new driver, and Windows loaded in 10 seconds
Hip Hip Hurray! Never would have guessed that huh?