Could it be a fuse that has caused two power windows to stop working on a 1994 mercury topaz?

Yes, it could be a blown fuse that has caused both power Windows to stop working on a 1994 Mercury Topaz. Power Windows typically share a fuse, so if that fuse is blown, it can affect both Windows simultaneously. It's also worth checking the window motors and switches, as these could be potential issues as well. Inspecting the fuse first is a simple and logical step in troubleshooting the problem.