Bios not seeing dvd-rom but XP does? Help!

Hi, I have 2 dvd's that are not being recognised by the bios - they used to be recognised for years by the bios. What's strange is that xp recognises them in the device manager and so doesexplorer. I had a networking problem and the solution is to repair windows via booting to the xp cd. Hence, I can't do that - this is a bother as even if I wanted to start from scratch the bios does't see either drive. sony dvd-rom ddu1612 sony dvd rw dru-500a If you can help - that would be great. Regards, Wazza

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