"Disabling in the BIOS" was in reference to an onboard, (integrated), audio chipset soldered to the MB... Only you will know if you have that, OR a regular plug-in sound card (in an ISA or PCI slot). Since you can't "pull the chipset" with a built-in sound chip, you can only use the BIOS to turn it off... That will allow the drivers for it to be removed (more completely) in the Device Manager. I assumed you knew where that was since you said you did things similar in there to try to solve this problem. To put that in perspective, you need to either turn off sound support in the BIOS, OR pull any sound card out of the computer. (While the computer is off and protected against static, etc.) Then Boot to SafeMode and remove ALL sound devices in DeviceManager. ONLY do that if you have the proper drivers handy to replace them with AND if you have the manufactures instructions on how to install them. While there, delete all "unknown devices", and re-boot a couple times (without a sound device) and see if any "unknown devices" return. If they do, (and the "sound" has been disabled as described above), then it would seem something else is causing that part of the problem... This may sound somewhat like what I said last time, but I am re-sending it as a newly created (from scratch) message to try to state it a little differently with a different spin on it. (Hope that helps.) Rick Glazier From: "Rowena Montgomery"> > I don't know of any drivers that have been installed after I bought the > computer except for two printers. Their drivers were installed from the CDs > which came with the printers. I have one printer attached to the computer > now. A while back, the computer suddenly didn't know it had a printer, but > that was fixed with System Restore. I don't think I have ever gotten that > "error caused by unknown device driver" message until after I did scandisk. > I clicked "Automatically fix file system errors" and"Scan for and attempt > recovery of bad sectors" > > How do I find "all" "unknown device driver"s? And how do I disable them > from the BIOS? -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.405 / Virus Database: 268.12.2/442 - Release Date: 9/8/2006 PCSOFT's List Owner's: Bob Wright<[log in to unmask]> Drew Dunn<[log in to unmask]>