If you just bought the laptop it shouldn't need any drivers. I'm assuming it has Windows 7 on it. From the way it sounds, you're probably not doing anything while it's freezing, or at least have tried not doing anything and it still freezes.
Don't bother with it - take it back. It's not going to be a software issue, you haven't had enough time to put anything on it that would make it lag. It's not going to be disk space and it shouldn't be a virus, after all, it's been freezing since you've gotten it right? Or maybe 30minutes to an hour after you've turned it on. If there was a specific problem with drivers or something it would be all over the internet already, and it's not. A factory image is put on there.
Either you have a dud piece of hardware or well... that's pretty much it. Take it back.
As far as a different model goes? Nah, you don't have to. Ask them if they have the same model, whatever you want.
When they say, "We'll repair it, it's still under warranty." Don't. You'll just have to wait for it to be repaired/ they'll have to order parts :P Pretty lame if you ask me