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Windows XP Home freezes on boot, safe mode stops on mup.sys.

Posted on 2006-07-18
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Last Modified: 2008-01-09
I have a computer I am trying to repair running Windows XP Home Edition. Only items plugged in are monitor and keyboard.

Symptons:
On bootup computer asks to boot in safe mode, boot with networking, boot with last known config, or boot normally.
If booted in safe mode computer freezes momentarily and reboots at mup.sys
If booted in with any other method computer will get to Windows XP progress splash screen. The progress bar will run thorough about 3 times before the computer reboots itself, and then back through the same loop.

I have tried using the installation disk and there is no option for repair within the intallation just two partitions to choose from to install Windows. If I do a Repair Recovery I can run a scndsk and it comes up clean. I have tried many of the other basics, I was wondering if anyone had any insight or solution to this mess. There are tons of online articles, but non of them offer a clear solution.

Thank you.
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Question by:kylevn
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6 Comments
 
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Expert Comment

by:spongiejm
ID: 17131873
If you have another machine with a working version of WinXP copy the mup.sys file onto a floppy. Then boot the computer from the windows XP Home CD or another XP CD if you have one. When prompted select R to enter the recovery console. After logging on go to the c:\windows\system32\drivers folder and locate the mup.sys file there. Rename the file to something like mup_bad.bak. Then copy the file from the floppy into the folder. Restart.
If you don't have a working WinXp machine but have the disk, you can boot from the cd and expand the d:i386\mup.sy_ file to c:\windows\system32\drivers folder.
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Expert Comment

by:spongiejm
ID: 17131892
Sorry there's an error in my post above, copy the d:\i386\mup.sy_ file to the c:\windows\system32\drivers folder
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Author Comment

by:kylevn
ID: 17132660
Could you please give me direction on how to do so within the recovery console. It seems to be a bit different than dos with permissions.

The problem I am encountering
You only have access to root directory and the Microsoft Windows directory. This means you cannot open any other directory.
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Accepted Solution

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spongiejm earned 2000 total points
ID: 17133725
When you log onto the recovery console I'm assuming you were directed to the c:\windows prompt. Assuming your cdrom drive letter is D, you can select the D drive by typing "D:" at the prompt. Once the drive has changed, type"expand d:\i386\mup.sy_ <space> c:\windows\system32\drivers". <space> means to insert a space between the two folder paths. Then type "restart" to restart windows.
If you are copying the file from a floppy to the folder you should be able to navigate to the system32/drivers folder to backup your existing mup.sys file. You can then select the floppy drive by typing "A:", then once the drive has changed type"copy A:\mup.sys <space> c:\windows\system32\drivers". You can then verify the file was copied and restart.
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