Thanks for doing that test and letting everyone know about the problem.
I use spybot and don't have excel installed so I don't have your problem.
***blues_harp28 is a friend and very good at tech support also a
distinguished member with 7,710 posts.
and he highly recommends Superantispyware,
you can get it here;
http://www.superantispyware.com/
So I would give it a try