OK lets see if we can restore the registry hives
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Choose command prompt.
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Once on the command prompt window, type c: and hit enter.
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Type the following commands into the DOS command prompt. Each one of these statements copy the original registry files to the current registry directory.
[b]copy C:\windows\system32\config\regback\system c:\windows\system32\config\system
copy C:\windows\system32\config\regback\software c:\windows\system32\config\software
copy C:\windows\system32\config\regback\security c:\windows\system32\config\security
copy C:\windows\system32\config\regback\sam c:\windows\system32\config\sam
copy C:\windows\system32\config\regback\default c:\windows\system32\config\default
[/b]
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Press the “Y” key after each copied file. This confirms that you want to overwrite the existing registry files.
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Remove the Windows 7 installation disc from the drive and reboot the machine.
The registry is now restored with original settings.