Simviation Forums

Hey guys, its been a while since ive been on the forums, anyhow heres my problem. My CD-ROM drives act very strange for instance when I put in the fsx standard edition disk both of them will read it. Then when I put in the deluxe disk or acceleration in both drives they do nothing at all. And the same thing for silent hunters wolves of the pacific. So if anyone knows what my problem is or can give me good advice it would be much appreciated. My Cd-Rom drives are a Plextor DVDR PX-716A and 52X CD-ROM.
Thanks guys.