Comments - M-D-S

To whom this may concern,
I just downloaded the Thrawn's Revenge Mod for my copy of Star Wars Empire at War: Forces of Corruption game however I can not seem to get it to work. Every time I try to move the mod folders into the Star Wars game files a box pops up and says "Please insert writable disc into drive D" and then ejects my game. If anyone here can offer some assistance in the matter it would be much appreciated.
Thank You.