Outlook 2000 - new error message

[Serious_Practitioner]

Thank you in advance for any assistance. I'm using Outlook 2000 on a Windows
XP Home machine (laptop). Last night, I used the clean-up tool for the "C"
drive, and the machine simply stopped running a few minutes into the
routine. No error message, simply stopped as dead as if I had shut it off. A
second try brought the same results.

This morning, each time I have started Outlook, I've gotten the following
error message -

"The application or DLL C:\WINDOWS\system32\xlibgfl254.dll is not a
valid Windows image. Please check this against your installation diskette."

Outlook runs once the "OK" button is clicked. Outlook has been very balky
for several months anyway, but archiving, defragmenting and the like
repeatedly didn't change that. So I figured that it was just age or
something.

I've never seen this error message before...can anyone tell me what it means
and what I have to do to either fix the problem or get rid of the message?
Thank you.


Steve E.