Posted 14 August 2010 - 12:24 PM
Hi: I'm running an HP with XP Media and recently encountered the infamous mup.sys error. We have not loaded any new hardware or software, so nothing should have changed, but now cannot boot. Safe Mode shows the last driver loaded to be mup.sys. I've searched the internet and see hundreds of potential solutions, but none have worked. Tried moving and reseating memory, unplugging devices, resetting BIOS, etc. I do not have my OS discs, but did use Recovery Mode to restore the OS from Recovery. One option I read about is to 'disable mup' or 'disable mup.sys' via a DOS command in Recovery Mode. This tells me it's not a recognized command. Many posts also say mup.sys is not the problem, it was the last successfully loaded driver. Searching for clues!!