I have created a custom Library under Windows 7 64bit professional to handle my source code. When I tried Windows Backup and Restore for the first time I get the following error

Backup encountered a problem while backing up file C:\Windows\System32\config\systemprofile\Source. Error:(The system cannot find the file specified. (0x80070002))

I've found a thread on the error on the Microsoft answers site. But it appears to be 404 (there is a version in Google's Cache) and the thread starter never gets an answer to his issue that works.

The official Microsoft answer on this is

This problem is due to one or more profiles under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\ProfileList with missing ProfileImagePath.

To check whether you have missing profiles:

1. Open regedit, navigate to the above registry key. (HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList). Expand the list
2. Click on each of the profiles listed. The first 3 profiles should have ProfileImagePath value of %SystemRoot%\System32\Config\SystemProfile, %SystemRoot%\ServiceProfiles\LocalService, and %SystemRoot%\ServiceProfiles\NetworkService respectively.
3. Starting from the 4th profile, the ProfileImagePath should contain path to the user profiles on your machine, such as C:\users\Christine
4. If one or more of the profile has no profile image, then you have missing profiles.

To work around this, delete the profile in question (Caution: The registry contains critical settings that are necessary for your system to function properly. Take extra caution while making changes)

1. First, export the ProfileList key for safekeeping. (Right click on the key, choose “Export”, and save it to the desktop.)
2. Right click on the profile in question, choose delete.
3. Try backup again.

This does not work for me.

Anyone have any idea what is going on here?