The first question to you should be what type of computer do you have?  Can't really help you out too much if we don't know what you got 
 
If your cpu doesn't support 64bit, you NEED 32 bit.  Windows doesn't automatically switch between the two, it's all 64bit or all 32bit.  I would guess from the fact that there are no drivers installed, that your laptop isn't 64bit.  Windows 7 should have almost all the new drivers for almost all older latops, and most newer stuff too by default.  So if you don't have them, then they probably don't exists, because the manufacture doesn't make them, because the hardware for your drivers doesn't support 64bit, so why make 64bit drivers?
Once we find out your computer specs as well, it's really easy to see if your proc (cpu) is 64bit or not.
If I was you, I would probably go back and get the 32bit version and see if that works, most likely it will.  
This is where OS X (Macs) shine.  They CAN run 32bit and 64bit programs/drivers side by side.  If your CPU is 64bit, and the program is 32bit and 64bit (OS X allows both version to be contained in one application, so no need to download two versions of the same software), OS X will choose the 64bit version over the 32bit version.  Apple is years ahead of windows when it comes to 64bit computing for the masses.  Infact 64bit windows is seriously a pain to setup for most "power" users, let alone your average user.  It's really a joke and kinda sad.  But what can you do?  
