Click Start > Run > type “regedit” without the quotes, and accept the UAC prompt to continue
Navigate to HKLM\Software\Policies\Microsoft\Windows\WindowsUpdate
Look at the keys in that folder, if they look something like this:
If this entries are listed under that folder, backup then delete the WindowsUpdate folder
Right-click on the folder and select “export” to save.
Delete the “WindowsUpdate” key from the registry at HKLM\Software\Policies\Microsoft\Windows.
Restart the Windows Update service. (located in Start > Run > type “services.msc” without quotes)"