Error message keeps appearing at startup

[Debra]

I have an error message that keeps popping up when I
start up computer. It says: This application has failed
to start because oscore.dll was not found. Re-installing
this application may fix this problem.

How do I go about finding this application so I can re-
install it?

Debra

 

[Tom Swift]

That file belongs to AOL Instant Messenger.

Tom Swift