Stan Sted
GMT is part of Gator Spyware and I'm sure has caused me problems too in a similar way on Windows 98. It seems to be very difficult to get rid of.. Thought I had got rid of it once.. but, it returned and is indeed still with me but I think no longer runs anymore!
I believe the latest version of Adaware may get rid of it, but not tried it yet myself.
Good Luck..