Is this only for audio CDs? have you tried any type of software on a disc?
This could also be atributed to new software/updates installed that uses the CD drive.
You can try the upper/lower filter fix but I dont think thats your issue. ( http://support.microsoft.com/default.aspx/kb/314060#fixit4me
You can also try to do a system restore to an earlier time to see if it fixes the problem. Post back with some more info.