I need some computer help, also.

So my computer came down with some type of virus (I am still trying to AVG scan and delete). It also has some malware on it because these random pop-ups come up that  usually dont come up. The virus must have fucked up my automatic updates in my Windows Security Center, because whenever I try and turn it on it says something is screwed up in the settings. Is there any way I can reinstall Automatic Updates? Thanks