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Fix registry on mounted drive

Posted on 2011-02-16
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Last Modified: 2012-05-11
Hello,

My XP PC won't boot. It gets to mup.sys in safe mode boot and hangs. I've tried the recovery options from the cd but I can't access the recovery console or selecvt a windows install to repair.

I can mount the hdd on a usb adapter fine. Can I fix the registry this way.

Thanks
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Question by:Petermcg001
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Expert Comment

by:oBdA
ID: 34905564
First, in Explorer, go to the Windows\system32\config folder of the "broken" XP disk.
Make a backup of "system" and "software" (no extension!)
Then open regedit, select HKLM in the left pane.
Go to the "File" menu, click "Load Hive". Browse to the Windows\system32\config folder, open "System" (no extension!). When asked for a name of the hive, choose "BrokenXP" or "Whatever".
This is the former HKLM\System hive of the XP installation. Change away (when exporting/importing reg files, note that the path you want to edit now is HKLM\BrokenXP\System, NOT HKLM\System!).
Once you're done, select the "BrokenXP" hive in the left pane, go to the "File" menu, click "Unload Hive".
The usual precautions when editing the registry apply - note that the local registry of the "working" machine is opened as well ...
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by:Petermcg001
ID: 34905644
Hello,

Thanks for this.  When I get to the "Change away" section can I import a registry from another XP machine.

Sorry if thats a silly question
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Expert Comment

by:oBdA
ID: 34905691
A running machine in the same network?
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by:Petermcg001
ID: 34905695
No unfortunately.
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Accepted Solution

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oBdA earned 500 total points
ID: 34906038
Sorry, misunderstood you probably; you want to import some HKLM\System settings from a working machine into "broken" registry?
Then export the key from the working machine into a reg file.
Open the reg file in Notepad.
Replace "[HKEY_LOCAL_MACHINE\SYSTEM" with "[HKEY_LOCAL_MACHINE\BrokenXP\SYSTEM" and save the file.
Import the file into the regedit where the "BrokenXP" hive is loaded.
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by:Petermcg001
ID: 34906408
Thanks, looks good
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