The error message means that your Windows Registry files are corrupted and Windows cannot start.
This is probably due to a hard drive failure but it might be possible to repair the registry for one more session so you can recover your data from the hard drive.
If you can boot from a Windows installation disk and get to the recovery console by pressing "R" then you might be able to overwrite the corrupted registry files with the default set which are stored on your hard drive.
Perform the following steps at the recovery console.
Step 1) Make a temporary directory to back up your registry files
md tmp
Step 2) Copy the damaged registry files to the temporary directory
copy c:\windows\system32\config\system c:\windows\tmp\system.bak
copy c:\windows\system32\config\software c:\windows\tmp\software.bak
copy c:\windows\system32\config\sam c:\windows\tmp\sam.bak
copy c:\windows\system32\config\security c:\windows\tmp\security.bak
copy c:\windows\system32\config\default c:\windows\tmp\default.bak
Step 3) Delete the damaged registry files
delete c:\windows\system32\config\system
delete c:\windows\system32\config\software
delete c:\windows\system32\config\sam
delete c:\windows\system32\config\security
delete c:\windows\system32\config\default
Step 4) Copy the default registry files into the correct location
copy c:\windows\repair\system c:\windows\system32\config\system
copy c:\windows\repair\software c:\windows\system32\config\software
copy c:\windows\repair\sam c:\windows\system32\config\sam
copy c:\windows\repair\security c:\windows\system32\config\security
copy c:\windows\repair\default c:\windows\system32\config\default
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