Background: running Win 98SE, two hd's (master/slave). I shut down to add 2nd cd-r, when I turned computer back on, the start-up phase did not recognise either hard drive, and I got "system disk not present, add disk and press enter", or words to that effect. I unplugged both cd's, and was freezing on startup. I removed cd players from Device Manager, ran SFC, scandisk, and scanreg/restore in safe mode to get going again. Now it seems to take a long time to boot, but does eventually, and runs fine. As soon as I add a player, back to the "no hard drive" thing. Unplug player...OK again.