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mup.sys boot hang on windows

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This entry was posted on 5/27/2007 4:26 PM and is filed under Technical.

Hung at mup.sys is a fairly common error on a Windows 2000, XP, or Vista system. If you scan the net for solutions for a mup.sys boot hang on windows you will find that there a many different resolutions recommended to solve this apparently confusing boot issue.

The truth is, this hang is not normally caused by the mup.sys driver itself. In fact, you can use the windows xp recovery console to disable loading mup.sys at startup and you will see the hang will then occur at the driver that had loaded previously to mup.sys. The real cause of this boot hang actually occurs during the windows boot process that follows after loading mup.sys.

What is happening during this boot process? Well after mup.sys loads windows starts configuring itself to the hardware specific to your system. It refers to ESCD data, PNP information and its registry. If there are problems processing that data you will get the described lockup or in some cases go into a reboot loop. Alas, there are even some more causes that get the best troubleshooters scratching their heads! Find the resolution here.

We have an updated tips and troubleshooting guide that will help you get to the root of this nasty boot hang issue and resolve it fast. As an added bonus we provide a unique, easy to understand description as to what actually mup.sys does from windows  programmer resources. 
Jump to Resolve mup.sys boot hangs on windows to get the full story.

Any questions, kudos, opinions, success stories or whatever?, Please feel free to leave a comment or two.
I'd really appreciate that!

Good luck and best to you! Thanks for stopping by.

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    • 7/24/2007 10:00 AM DanO wrote:
      THANK YOU!! This resolved my very troublesome problem. Great fix, much appreciated.

      Dan
      Reply to this
    • 10/18/2007 9:35 AM Raoul wrote:
      2 comments regarding your solution for the WinXP "mup.sys" problem: Number 1 (and less important), I followed your instructions for restoring the registry, and upon re-entering Windows with the original "first-boot" or backup registry files, Windows required that I activate the product. I was wired, so activation was clean and quick over the internet, but this is something I didn't expect to encounter, as your instructions didn't mention it. You might possibly include a blurp in the overall process that alerts folks that once booting with the backup registry AND as well with the more recent registry entries from System Restore, Windows might require reactivation. O.K, on to comment number 2 (much more important): THANK YOU THANK YOU THANK YOU !!!!!!! This is a very well laid out set of instructions for even the pc novice to follow, and saved me from a tremendous headache of trying to salvage something of my non-booting hard drive. This worked flawlessly. BTW, did I say THANK YOU?!!! Huge :-)
      Reply to this
    • 10/30/2007 8:15 PM Glenn Schweikart wrote:
      XP won't boot? - Performing a manual restore of the Windows XP registry

      very good instructions I used bartPE instead of restore console but it works like a charm

      thankx

      glenn
      Reply to this
    • 1/29/2010 12:11 PM Tshann wrote:
      Hi,
      I just wanted to write in a thank you. The involved process of restoring the registry that is referred to above completely allowed me to boot into Windows and get a stable OS again. Wonderful and thorough step by step. Thanks!
      Reply to this
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