Today i`ve installed Vista SP1 over regular Windows update.
(64 MB download and 1,5 hours, 2 restarts automatically, no problems until now)
I was surprised looking into the Vista security center after last restart.
Now Avast! Antivirus 4.8 seems to be a real antispyware.
See my picture.
Well Avast did get the checkmark certification the other week ;D My SP1 shows the same as well