I have an identical problem that the one I quote below; but although I know I have to delete the .sys file in discuss, the answer says that I hve to remove the lowerfilter and upperfilter keys too, and I unfortunately don't know how to. Could you help me!??? please! Quoting begins: "08-08-2006, 11:20 PM K1N3tIc [0N3]'s Avatar K1N3tIc [0N3] K1N3tIc [0N3] is offline Newcomer, in training Join Date: Jul 2006 Location: Chicago, IL Posts: 6 Question PxHelp20.sys running Windows XP Media Center w/SP2, Pentium M 1.86G, 1G DDR2 RAM. Windows will not recognize any CD/DVD drive that is installed. The drive icon doesn't appear in "My Computer" under "Devices with removable storage". Event Viewer/System: Event Id 7026, Error, "The following boot-start or system-start driver(s) failed to load: PxHelp20" Device Manager/DVD_CD-ROM drives: "Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (code 39) << Ok, I've searched high and low for this file which is a .sys file. I always come to a website that wants me to pay for the file. I copied my buddies PxHelp20.sys file and installed it in the proper file (%systemroot%/WINDOWS/system32/drivers), but alas it's device specific. This I know because after placing said file in the drivers folder and restarting, windows would not boot. All is well now though. The drive worked when I used it to boot from. I've searched the manufacturers website, Philips, to no avail. I don't necessarily need the answer, just point me in the right direction. I am an aspiring geek although not being able to figure this one out on my own has severely deminished what little cred I have. __________________ "Do or do not. There is no try."