Shdoclc.dll bad image error

Archived from groups: microsoft.public.windowsxp.help_and_support (More info?)

Here's the error.
MSN Messenger (BETA): Msnmsgr.exe - bad image
The application or DLL c:\WINDOWS/System32/schdoclc.dll is not a valid
Windows image. Please check this against your installation diskette.

Each time it comes up it changes..but only from "system32" to "System32"

It does it anytime you open MSN, im or do anything w/ messenger.
A few websites get it too.
I've deleted all temp files, run spybot and adaware and a virus scan
(nortons 2005 which was installed recently)
This is my inlaws computer and their son downloads ALOT, not sure if that's
the culprit.
Thank you for ANY help!