Vista no longer asks for a password after coming out of sleep mode. This has only started happening in the past week or so. For a few days the password page was also a strange orangey colour instead of blue, until I moved the mouse.
Vista still asks for a password coming from "off" mode.
I tried system restore, but it only went back a couple of days, not far enough (I still have the problem).
A full scan with Avast didn't turn up anything.