CD not Recognized

Im not sure why but it seems after installing Framework 2.0 this comp is
screwed. Now when I try to play NFS Hot Pursuit2 or Underground. the Security
crap on the disk isn't being read and it keeps telling me to insert the
correct disk. I have reinstalled several times and still have no luck. I have
uninstalled back to Framwork 1.0 with no luck. But when I first noticedx the
problem me Drives were dissappearing? I installed NFS Hot pursuit 2 rebooted
and then there was no CD Drive in My computer. I uninstalled to Framework 1
and yes the drives are back and I tried to install NFS HP@ and still get CD
Checking error? I am stumped. I have removed everything from the Reg NFS
related and stilll no luck?