Avast deleting system files

Hi,

I thought I had a virus on this system so I intalled avast.

During scanning it noticed a few odd files so i chose delete all.

It then continued scanning.

I have just now tried to access control panel and it says "rundll.dll could not be found "

I try regedit and it says that cant be found either.

Same thing with cmd.

Avast has deleted all of them??


I can't even run sfc /scannow



Any help?