Taskup

On several computers in my lab, Taskup keeps popping up whenever anyone uses Word and types a letter “t”. And you can’t get rid of it. It looks like a dialogue box for saving a file, but there’s nothing that gets saved. I have no idea why it occurs on some and not all of the computers in the lab (all IBM using Windows 2000, 128 megs of RAM), but it doesn’t stop and makes it almost impossible to type a document. Any ideas?