XP Boot hangs at MUP.sys

Mother board: ECS 945GCT-
March 25, 2008 at 04:23:04
Specs: XP Pro SP2, Pentium Dual Core E2140 1

When I try and boot my XP machine, it displays the XP splash screen and then simply restarts. The same happens on all boot options, although safe mode does show that it always restarts after loading mup.sys.
What could be the problem, and how could I fix it? I have tried disabling mup from the recovery console, but it gives an error:
'The system registry does not appear to have an active ControlSet key.'

Thanks for any help.

See More: XP Boot hangs at MUP.sys

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March 25, 2008 at 04:36:45

Did you Google that error?


I also found this:


Life's more painless for the brainless.

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March 25, 2008 at 05:38:27

Thanks for the links.
I found a Microsoft article (http://support.microsoft.com/default.aspx?scid=kb;en-us;307545) that should repair the registry, but I can't get it to work. On part 1 step 5, I don't seem to have a repair folder to copy the new files from. Also, Windows seems to be installed to c:\MiniNT rather than c:\windows. I put this in the command prompts, but there was still no repair folder.

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March 25, 2008 at 05:54:02

The system folder MiniNT indicates that you are running WinPE which is the lightweight version of Windows XP. If this is true, try substitute WiniNT for Windows folder cited in the MSKB you are following.


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March 25, 2008 at 07:00:23

Hi XPUser,
I already tried that, but no luck.
There was no c:\windows\repair or c:\MiniNT\repair folders.

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March 25, 2008 at 07:12:26

Take a look at the following thread - it may help you resolve mup.sys problem as it did the the original poster.



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March 25, 2008 at 08:51:32

tomcorker, "although safe mode does show that it always restarts after loading mup.sys."

Isn't there an option to turn off automatically restart when you try safe mode? That way you will get the error causing ur problem when the PC shuts down.
Post the exact error and we may be able to help u further.

Some HELP in posting on Cnet plus free progs and instructions Glad to Help!

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March 25, 2008 at 09:24:18

XpUser, I tried the trick with unplugging the mouse and running chkdsk, but still no luck.

XpUser4Real, I don't seem to have an option to disable automatic restarts. Should it be on the menu screen with the Safe modes (networking, command prompt) and last know good config? It's not there. Any ideas?

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March 25, 2008 at 10:04:19

The 'disable auto restarts' should be on the boot menu along with 'Last known good configuration' and a bunch of other options.

You might have to consider a repair install. It will restore the OS and only remove the windows updates.


By the way, mup.sys is probably not the problem. It's usually the last thing that shows on the screen while windows is getting his act together.

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