A friend of mine has Vista and it has been crashing for quite some time.
He gets a regular crash with blue screen and a message that goes like "disable netbios caching" (it goes bye so fast i can't get the whole message) then it reboots.
Me thinks it has something to do with CCleaner but he insists that this never happened before. He's been using this program for quite some time but i still think this program does too much tweaking (often unnecessary).