I inadvertently installed some cd-rom drivers from a disc I had for some other computer. Nothing seemed to happen but I did not test the drives. Then I re-installed XP Home. The cd-rw is recognized and all is ok in device manage but it will not read a cd. I tried an Acronis restore to a time before my inadvertent stupidity. Same problem. I removed that cd-rw and installed a cd-rw and a cd-rom from another computer setting it up the same as I removed it. All is well in device manager and seems ok in the standard cmos setup. The cd-rw will not read a disc and asks for one. The cd-rom is ok and will allow me to boot from it. I checked IDE ATA ATAPI in device manager and all seems ok. I wonder if the cd-rom driver install may have screwed up something in the bios or some other place I know little about. There were files on the driver disc for things like ATA, SATA and a bunch of stuff I don't know what it is but I'm pretty sure no updates for a bios. I am using an external usb dvd-rw and don't really need the cd-rw but it bugs me to not be able to fix it. Any ideas?