[Ntrails]

Ignoring that most users run their main windows login as administrator, if we pretend it's just a guest account, how much of an impediment would that to them disrupting any anti-virus and installing a some malware?

[xtdx]

Are you asking if anybody has a 0day windows kernel exploit? Or if lots of users are going to click okie dokie when the uac prompt comes up?

I'd say yes and yes.