During the MS update process (Vista 64bit) avast! accused the "Trustedinstaller.exe" (located in "C:\windows\servicing\") as rootkit.
I think this is a false positive since this file is AFAIK an essential part of Windows (Update).
Can you confirm this false positive?
Unfortunately after several clicks in the notification window (I tried to choose "Ignore", there were not much options) it was not possible to close the notification window with a regular button (it was some kind of blocked), so i closed it using the "x", which obviously caused, that this file has been deleted :-(
This has as major effect, that Windows Update will not work anymore (since the Trusted Installer Service is broken, because it is based on this .exe)... About an hour to repair this