If you just bought it, the drivers you need should be already installed. If there are only 64bit drivers on the website, it's probably because they only offer that laptop with a 64bit Operating System.
It may be able to run a 32-bit OS as well, as 64 bit is for the most part backward-compatible with 32-bit hardware. However, if 32-bit drivers aren't made, you're out of luck. Get the 64-bit version of Windows 7.
Besides, if you're computers fully capable of running a 64-bit OS, its worth spending the extra buck to grab the proper OS. That's twice as many bits it processes at a time. It adds up.
Then I suggest getting a hold of a 64bit version of Windows 7
Best answer I've heard so far. If you have the 32-bit version (assuming you didn't get it OEM from Newegg or something) then you should also have the 64-bit disk. If not then you'll just end up paying the amount everyone normally does.