http://answers.microsoft.com/en-us/windows/forum/windows_7-update/service-registration-missing-or-corrupt-fixed/207024d7-7017-4fcf-a57d-f2cc431985c2

 Service Registration missing or corrupt – FIXED

 

I was having the same problem as many others, Windows Update was sloooowww !

I ran the Windows Update Troubleshooter, it said that the Service Registration was missing or corrupt, and not fixed.

So I searched this site, and found some suggested solutions that I was afraid to try ( I am a real amateur ).

 

On a whim, I removed update KB3138612, which supposedly “contains some improvements to Windows Update Client in Windows 7 SP1”.

 

I then re-ran the Windows Update Troubleshooter, Service Registration was FIXED.

Ran Windows Update, 2 minutes and done!

 

KB3138612 was offered again as Important. - - - I did not install this !

 

Perhaps I am on to something – anyone else care to try this?

 
Tom