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As Rik said GA, you will probably need to replace the CD drivers.
Whatever it takes to get into xp (even safemode) do it.

Then go to your control panel / system / Hardware tab / Device manager.
(NOTE: If the conflict is in fact with the cd-rw - there should be a yellow question mark "?" Located next to it.)

Then in there, open the "dvd/cd rom drives" (click on the plus symbol).

Then double click on the cd player in there.
You will find the driver wizard under the "Driver" tab.

If there is a question mark, I recommend removing the cd drivers first, then rebooting with your xp disc in.
It should automatically detect the cd rom and install the correct drivers.

Good luck.