Looking for idle computer password program

[rob2]

I'll be moving back into my college dorm tomorrow and was thinking about computer security when I leave my computer on. More specifically, when I leave partypoker on overnight or during classes to datamine some tables.

I'd like to find a program that allows me to password protect my computer when it's idle for 5 minutes or more and goes into screen saver and the monitor powers down. I've enabled windows xp password so that's fine for computer start up. But the option to prompt for password when I deactivate my screen saver seems to only work about half the time. The other half it doesn't ask for a password and my computer is open. I want it to ask for a pw every time my computer comes out of idle mode.

I don't much money in my party account but I want to protect against someone using my computer and seeing partypoker open. I trust my roommate very much, but not quite as much if he comes home drunk and decides it's time for a little blackjack action. And I don't trust his friends at all.

Thanks for the help guys.