A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
For me it was Nokia Suite that was causing the problem.
I put up with this nonsense for years on my PC not knowing what was causing it.
It was only when I recently switched to a Mac running Excel 2010 in Parallels that I noticed, straight after I installed Nokia Suite (in Parallels) the bug came back, bigger than ever, even when Nokia Suite was closed.
Somebody at Experts Exchange suggested I remove Nokia Suite and it worked, so far no problems, I've got a sensible my Excel back!
It really is silly that a prominent program like Excel can get cruelled by a program like Nokia Suite even when it is closed.
Now, of course, I have to find another way to download my Nokia photos and texts on the Mac, short of having two computers. (My Nokia phone is a 4 year old Symbian model that I love).