A worksheet "MSR" is created on my laptop.

If I send it to Paul's laptop he gets an error "Can't find project or
library" when swiping in information. He sends me the file back, I can't
replicate the error.

If I email it to IT they have no problem, but when it comes back both Paul
and I get the same error (different dll as culprit).

I know the fix on a case by case basis, but what causes this? The "project
or library" that cannot be found after its trip to IT is "Yverinfo 1.0",
which is a Yahoo Messenger dll. Why would this have become an integral part
of my worksheet, and how do I stop it happening?

Brgds, Sian