It is possible to separate the Project Explorer window so that it floats
over the VBA IDE window as a popup. It would then be possible to move the
window off screen. If this is what has happened in your case, you should see
the Title Bar of the VBA window dim when you press Ctrl+R, as the
(off-screen) Project window takes focus.
It this is what has happened, you might be able to locate the window by
choosing a higher resolution on your monitor, and see if you can get the
off-screen monitor back on screen. Some video cards (even on laptops)
support multiple screens, so you might be able to changes modes (e.g. set
them to Clone-mode) so they both show the same thing and the window is no
longer off-screen.
There is probably a registry setting for this window, but I don't know what
it is. If anyone does, please contribute.
Reinstalling would probably not help unless you completely remove Office
first so it does not remember the location of this window.