I have been having some problems with my HP Pavilion, running Windows
8.1. It seemed to be loaded up with trash and other forms of malware.
I bought an on-line copy of Malwarebites, installed it and ran it this
morning. Everything went very well and most of the problems seem to
have been eradicated...but, I keep getting a pop-up saying,

There was a problem starting
C:\Gordon\ApData\Local\ARCADE~1\CATHEL~1.DLL
The specified module could not be found.

What is causing this, and how can I get rid of it?

Thanks, Gordon