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Deleted registry Key, now windows won't boot

Posted on 2006-11-19
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Last Modified: 2008-01-09
Hi all,
I followed some bad advice and deleted the following key from my XP registry

HKEY_CLASSES_ROOT\CLSID\

now my machine will not boot, it just gets to the blue login screen, but instead of having my login icon, has a small windows xp icon. Exactly the same in safe mode.

How can I restore this key, can I do it from recovery console? Will a windows repair, restore it?

I really, really need to not risk losing any data.

Thanks in advance
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Question by:RedKelvin
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4 Comments
 
LVL 7

Expert Comment

by:jalilthe1
ID: 17974433
How to Repair the Windows Registry
http://www.easydesksoftware.com/howto.htm

Registry Repair Wizard 2007 - The Official Website of Registry ...
http://www.topshareware.com/Registry-First-Aid-download-41796.htm

Get Registry Fix
www.registryfix.com

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tim_qui earned 500 total points
ID: 17974563
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Expert Comment

by:sramesh2k
ID: 17974709
Hi RedKelvin,

>> How can I restore this key, can I do it from recovery console?

Yes. Or, even easier is to use BartPE boot CD. If you have System Restore enabled in the subject computer, you can recover the SOFTWARE hive from one of the System Restore points.

Create a BartPE Boot CD (See: http://www.nu2.nu/pebuilder/)
Boot the system with the Bart's CD.

Get into the System Volume Information folder located in the drive where Windows is installed. Then, open a sub-folder that was not created at the current time. You may have to click Details on the View menu to see when these folders were created. There may be one or more folders starting with "RPx under this folder. These are restore points.

Open one of these folders to locate a Snapshot subfolder. The following path is an example of a folder path to the Snapshot folder:
C:\System Volume Information\_restore{D86480E3-73EF-47BC-A0EB-A81BE6EE3ED8}\RP1\Snapshot

From the Snapshot folder, copy the following file to the following location:

C:\Windows\System32\Config

_REGISTRY_MACHINE_SOFTWARE

Rename the file named "SOFTWARE" to "OLD_SOFTWARE"
Rename "_REGISTRY_MACHINE_SOFTWARE" to "SOFTWARE"
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Author Comment

by:RedKelvin
ID: 17976625
I attempted many things, but in the end all I could do was rebuild the hive,

Thanks for the input
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