Today I encountered a problem with Windows 7 Backup & Recovery. I was not able to backup anything on my computer. The Windows 7 Backup fails with error 0x80070002 – file not found. After a long search I found that there is a misconfiguration in the registry. In Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList the active profiles are listed. It appears that I have deleted some of those profiles from C:\Users manually without removing them from registry. After deleting those keys I was able to start the Windows Backup normally