Hi MM0,
An unfortunate situation. I have never heard of anything like this myself. Hopefully a system restore will work, otherwise you may need to repair or reinstall windows.
One thing you can try though, is to see if the built in windows speech recognition is still working. If it is, then the problem may lie only with VoxCommando. If it is not then it is a windows problem and you are stuck with the window system restore, repair, or reinstall I think...
Either way, very strange.