Windows Security Center does not recognize my anti-virus software

[Who]

I recently purchased the full version AVG and it works great but Vista does
not recognize that I have a anti-virus running. What do I need to do? I have
tried fixing it in the command prompt with winmgmt/salvagerepository and
winmgmt/ verifyrepository but they both tell my access denied but I am the
admin on the comp so it should not do that! is there any other way to fix
this? It is driving me crazy!

[Engel]

Did you run Command Prompt, by right-clicking the shortcut and choosing "Run
as Administrator"?

Did you install Windows Live OneCare?