My previously fine CD burner, dvd-rom and a: drive are all showing as "not accessible" when I try to browse to access the CD, DVD or floppy disk in them. I am running Windows XP on a Pentium 3. Already tried uninstalling CD burner and DVD in safe mode and reinstalling - no change. When I reboot the CD Burner will work one time and read a Program CD, then it goes back to "not accessible," DVD and a: drive will not work at all. Any ideas? Thanks!