EXS 24 Logic Sampler Users Group

i recently had to initialize my harddrive and reinstall everything.

now, for some reason, when i try to open the exs24 the computer says:

Insert disc to install Exs24 like it always did...


but it doesn't recognize the disc after i put it in there. I press 
continue and it just doesn't pick up its presence....

anybody know what's goin' down???

thanks in advance!