Serious problem with Warcraft 3 Viewer

First of all, I can run Warcraft3 on my system without any problems. But whenever I try to run Warcraft 3 Viewer, it works fine for a couple of seconds, then my whole computer freezes and I have to reboot. Does anyone know how to fix this?

Thanks

probably your comp's problem
works fine for me

Bet what is wierd is that Warcraft 3 runs without problems. It never has had problems.