I tried this. Technet instructs me to go to System tools, System Information, Tools & then System File Checker. Only problem is, (my) Windows XP has no System File Checker! If anyone can help on this, thanks
Here's the start of the verbatim instructions
Source of the Proble
Getting an error message when you shut down Microsoft Windows® isn't as serious as getting one when you start up Windows, but it still leaves you with the uncomfortable feeling that something's wrong with your computer. The most common error message that appears when you shut down Windows is about Rundll32 or Msgsrv32, two files that Windows uses during the shutdown process. You can often solve the trouble by replacing these files
Reinstalling Rundll32 requires extracting the original file from the Windows CD. Fixing error messages about Msgsrv32 requires reinstalling the drivers for your sound card because, among its other functions, Msgsrv32 plays the Windows shutdown sound. Here's how to take care of both of these tasks
How to Fix I
Insert the Windows CD in the CD-ROM drive.
Click Start, point to Programs, point to Accessories, point to System Tools, and then click System Information.
On the Tools menu, click System File Checker.
In the System File Checker dialog box, click Extract One File From Installation Disk.
In the Specify the system file you would like to restore box (Figure 1), type Rundll32.exe, and then click Start