Something is very wrong with my new laptop.

When I boot it, windows loads, I select my user and enter my password, my desktop pops up, and about 10 seconds later it freezes and requires a hard shut down. I'm currently in safe mode under Billy's user (which has no programs on it). How in the world can I figure out what the problem is? Is something that is autorunning on startup causing the problem, and if so, how do I isolate it when I can't even get windows to load without locking up? Argh!