Access violation -- alerts

Sometimes when rearranging files and folders in WinExplorer and just before PC shutdown, Windows shows an alert (sometimes) ...
Access violation at address 036A62D2. Read of address FFFFFFFF.
... the address "xxxxxxxx" is always different.
This is the first time I have managed to (not be in a hurry) and captured the message.

Q. What does it mean ?
Tower build 2012
WinXP sp1 -- on another PC sp2 sabotaged Excel (2003)
Stand alone PC -- no Internet connection
C: drive for system
E: drive for data
MS Office 2003
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This issue can be caused by any of the following possibilities.

1. Hard disk drive is short on available disk space.
2. Several software programs have been installed/uninstalled leaving behind bad files and/or confusing the software.
3. Data Corruption.
4. Computer is overheating.
5. Bad Hardware.

Below are steps for Microsoft Windows that should help speed up the computer or determine why the computer is running slow.

1. If you have a hard disk drive that is 2GB or smaller, ensure that there is at least 200MB of hard disk drive space free. If you have a hard drive larger than this size, verify that there is at least 500MB of free hard disk space. This available space allows the computer to have room for the swap file to increase in size as well as room for temporary files.
2. Run Checkdisk or something equivalent to help ensure that there is nothing physically wrong with the computer hard disk drive.
3. Run Defrag to help ensure that data is arranged in the best possible order.
4. Remove or disable any or programs that automatically start each time the computer boots.
5. Verify that the device manager has no conflicts, but if conflicts are present, resolve them.
6. If you have Windows XP try deleting all files in the prefetch directory. These are prefetch files and can lower system resources if loading programs no longer being used.
7. Try running through the basic troubleshooting steps for your operating system.
8. Make sure your computer and processor is not overheating, excessive heat can cause a significant decrease in computer performance some processors will even lower the speed of the processor automatically to help compensate for the heat related issues.
9. Finally, if none of the above solutions resolve your issues, it is recommended that you either reinstall Windows or erase everything and then start over.