driver keeps failing

You will need to post what OS you are using.  Is this a STOP error?

I'm using XP Pro SP1. Not sure what you mean by STOP error.

Something like the Stop errors and blue screens found here: http://www.aumha.org/win5/kbestop.php

000000ca is
0x000000CA: PNP_DETECTED_FATAL_ERROR

Yes, it is a STOP error. How would I go about finding what exactly is failing?

If it's 0xCA, I found this: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/ddtools/hh/ddtools/BCCodes_a4c9797f-9596-475d-9fb1-d5994ca4327c.xml.asp

Basically, you have a bad or corrupt driver in there.  What might fix it is a SFC /SCANNOW, run from a DOS shell.  It will require your WinXP CD and it will attempt to restore the driver it thinks is good.  You will need to update patches again, though.

I tried the command but it didn't help because the PC keeps on rebooting from time to time.
Any other suggestions?

Possible memory problem, or heat problem.  What cpu are you running, and what temperatures are you seeing?  Everest can help monitor temperatures: http://www.lavalys.com/index.php?page=product&view=1&subpage=5

For memory testing, try www.memtest86.com.  If it fails, you know the RAM is bad; if it passes, it may be a false positive.

Here is the info on the CPU:
CPU Type      Mobile Intel Pentium IIIE, 750 MHz (8 x 94)
CPU Alias      Coppermine, CuMine, A80526
Instruction Set      x86, MMX, SSE
Original Clock      800 MHz
L1 Code Cache      16 KB
L1 Data Cache      16 KB
L2 Cache      256 KB (On-Die, ATC, Full-Speed)
CPU Manufacturer      
Company Name      Intel Corporation
CPU Utilization      
CPU #1      35 %
The CPU is not overheating but it is interesting that you brought up memory. I did run the program you suggested; it took a long time but I did run it. It did not find any errors with the memory but here is what I've experienced and I'm not sure if it relates to this problem.
From time to time, when I bring my PC from hibernation, I only see 256MB of RAM when the laptop has 512 (it doesn't always happen but it does happen about 70% of time). I took out the memory piece that I thought caused problems and booted with one 256 piece in both slots and it ran fine from either slot (to test if it is the slot and not the memory). I bought a new 256MB piece and it worked the first week or so then I started seeing only 256MB of RAM again. Now, when I boot with only one 256MB from one of the two slots, the PC won't boot which means that the slot on the motherboard is bad (that did not happen until after I bought the new 256MB piece). This happened just recently. My questions is, could that have been the cause of the PC automatically rebooting? I think that one of my memory slots is slowly dying because I have no other explanation for this.

That's what I was expecting. I will award the points to you because you have been very helpful.

Thank you.

Ok, thanks for the consideration.