Would you happen to know if you've done any driver updates recently? If you have, that might be the problem. If you haven't, that might also be the problem. What you can try is open the Device Manager (forget where it is in XP, but in Vista you just need to type in Device Manger in the Start search to open it) and look for your disk drive. Right click it and hit Properties. Click the Driver tab and see if you can update it. If that fails or it not clickable, you might be able to try a driver rollback, which will be right under it.
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