I did see one thread about disappearing drivers in a laptop, this is a little similar. This machine now has win98 on c:, 2000 adv server on D:, and 2000 pro on E:. Pro was on C: (my mistake)then removed, to install win98 on c: the partition was reformatted, MBR warning popped up (with warning noise). With c: blank a start up disk was used to gain access to CD drive and run install, seemed to go OK. Used "CD PRO" disc from M/B to install drivers, after restart "success message" appears. Still no PCI devices "!" in device manager (3 places). Also the software says to manually install driver for "PCI mass storage" device which does not appear in D manager. Tried several times to no avail, sometimes when adding manually I see the path to the file and itsays it is done but on restart, its gone. Did the boot disk make a default MBR? Should I have run fdisk /mbr? Any hints to reinstall it?