Please someone, help!

We've been getting an error message at startup:

"ERROR: Could not execute Main: The system cannot find the file specified."

The heading is: WJView Error

I was able to trace it to 'C:\WINDOWS\Prefetch' when I conducted a search for WJView. The file name is: WJVIEW.EXE-0505A0CF.pf.

Questions: What is 'prefetch' & is it important? It kinda looks like a bunch of 'Temp' files.
How do I repair the error, so that the message does not show up again?

Running XP Home Edition on a Pentium 4.

Thanks in advance for your help.


Tee