Had a virus, cleaned up, now I can't save changes to homegroup setting

[newtype06]

Just like the title says, whenever I click save it just takes me back a screen.
I can change the password, and I can leave and create the homegroup, but I still cannot change any settings including advanced settings.
This is on a friends laptop, it is windows 7 ultimate 32 bit.

 

[Maguscreed]

try running a secure file check, it's possible the virus damaged some system files.
http://www.sevenforums.com/tutorials/1538-sfc-scannow-command-system-file-checker.html

 

[newtype06]

I did sfc /scannow in an elevated command prompt. It ran all the way, and than the cmd prompt closed. I did open it from typing cmd and opening a command prompt, so I'm not sure what that means.