Why don't you re-install the MS office once again, there might be some problem of registries in the system. I hope the problem will be solved.
This is taking over everything. "Avast is analyzing a suspicious program" - Winword - that I've had on this machine for eight years. And then it closes it down. I can't open it. I'm getting Avast OFF my machine quick, fast, and in a hurry if they're going to go WAY overboard like this!