Blue Screen of Death

You can take a look at this page to see some good info on the various STOP messages.  For yours, scroll down in the left pane to the link for 0xD1 and click on it.

http://aumha.org/win5/kbestop.htm

Here's the info at that link:

0x000000D1: DRIVER_IRQL_NOT_LESS_OR_EQUAL
(Click to consult the online Win XP Resource Kit article.)
The system attempted to access pageable memory using a kernel process IRQL that was too high. The most typical cause is a bad device driver (one that uses improper addresses). It can also be caused by caused by faulty or mismatched RAM, or a damaged pagefile
Error Message with RAM Problems or Damaged Virtual Memory Manager {KB 810093} Win XP Home (during restart)
“STOP:0xD1” Error Message When You Start Your Win XP-Based Computer {KB 316208} Win XP
Stop 0x000000D1 Error Message When You Turn Your Computer Off {KB 317326} Win XP (with USB device(s) connected)
“STOP 0x000000D1 IRQL_NOT_LESS_OR_EQUAL Kbdclass.sys” Error Message When You Try to Shut Down the Computer {KB 810980} Win 2000, Win XP (Logitech mouse with outdated MouseWare software)
WRQ AtGuard Program Causes Error Message in Win XP {KB 319870} Win XP (AtGuard version 3.22)

Greets Rodger Dodger,

Could you elaborate on this. I Presume this error occurs on bootup, right before the Kernel loads. Have you tried booting into safe mode yet? IDEChnDr.sys is an ATAPI/IDE Channel Driver.

I believe your course of action would be to reload your IDE channel drivers for the motherboard, as well as any IDE drive controllers you have in your system. If you cannot enter windows kernel, press F8 while booting, and select 'Safe Mode' from the bootup menu. Once in windows, install the drivers from the disc that came with your motherboard. If you cannot find drivers, or If you have an OEM machine, I will locate the appropriate drivers for you.

Good Luck, and let me know what happens.
Charlie...

The times it is happening, as of now, is when she backs-up data to the CD-RW.  I can understand the relationship with the IDEChndr.sys.  Intel suggests upgrading the controller drivers to the Intel Application Accelerator, and I will look into updating her software to the most current version. If that doesn't work, I will reinstall windows XP or do a repair install.  Does a repair install actually do anything?

A final question:  What is happening to the drivers that would suddenly produce the BSOD (after 2 years)?  What is happening in the system, 0x000000D1: DRIVER_IRQL_NOT_LESS_OR_EQUAL, that results in the BSOD?

If this is all of a sudden happening after 2 years, it sounds like the drivers have become corrupted on the hard drive. You might try uninstalling the CD-RW drive in Device Manager, then rebooting and letting the New Hardware wizard reinstall it. As for a repair install:

To perform an XP repair:

http://www.microsoft.com/WindowsXP/expertzone/tips/dougknox/doug92.asp 

Configure your computer to start from the CD-ROM drive. Then insert your Windows XP Setup CD, and restart your computer.

When the Press any key to boot from CD message is displayed on your screen, press a key to start your computer from the Windows XP CD.
Press ENTER when you see the message To setup Windows XP now, and then press ENTER displayed on the Welcome to Setup screen.
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Do not choose the option to press R to use the Recovery Console.
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In the Windows XP Licensing Agreement, press F8 to agree to the license agreement.
Make sure that your current installation of Windows XP is selected in the box, and then press R to repair Windows XP.
Follow the instructions on the screen to complete Setup.

Here are a couple of Microsoft Knowledge Base articles you should read which concern possible data loss when you reinstall/repair XP:

http://support.microsoft.com/default.aspx?scid=kb;EN-US;312369
You May Lose Data or Program Settings After Reinstalling, Repairing, or Upgrading Windows XP

http://support.microsoft.com/default.aspx?scid=kb;EN-US;312368
Data Loss May Occur After Reinstalling, Repairing, or Upgrading Windows XP
 
Note that, from the above articles, the problem of data loss if your Windows XP was installed by the OEM (Original Equipment Manufacturer) has been corrected if your Windows XP has Service Pack 1 installed.

I want to thank all of you for your help.  I went throught the girations of doing a repair install, and then a full clean install.  After a clean install I received an immediate BSOD with STOP: 0x0000000a error IRQL_NOT_LESS_OR_EQUAL.  After using one of my hard drives to boot, the computer worked fine and fast.  Yes, folks, the hard drive is fried.  

Again, thank you all for the input!