Help! missing XMCE software

Microsoft Windows

I had a problem with my media center and had to go back a few weeks using
system restore. For some reason I am now not able to connect with my Xbox
extender software(even thought it was installed back in December). It tells
me I need to place install disk in my media center. However, it's MIA. Is
there any way I can get a replacement install disk from Microsoft? I still
see the extender resource monitor there - so it's partly installed.
I have the same problem. what is the answer?
Xbox support (1-800-4MY-XBOX) might be able to help out if you have proof of
purchase for the software.