Help with Windows update error

Hey i would really like it for someone to help me i dont feel like reinstalling windows 7 ....

 

 

My buddy deleted a file in my registry i think it was a "windows games file" to get me Grand theft auto 4(game) to work and the game works but since i got that file deleted my windows update keeps on saying CODE 800b0100 error i think its because the file is missing. What can i do to get my windows update to work again i tryed HOTFIX FOR WINDOWS and the microsoft programs to get it working again and no luck.....

 

Id love to get my windows update to work again

 

:) thx

 

-Scan