Driver issues with Windows 7 installation through Bootcamp

Some background: I've got Windows 7 62 bit installed on a 30 gb partition via Bootcamp. My Macbook is from the summer of 2010, and it's currently running Snow Leopard. I don't have a copy of the Mac OS X installation disc (it didn't come with my Macbook), so instead I downloaded the drivers off the Apple website (Boot Camp Support Software 5.0.5033) and put it on a flashdrive.

Issue: Once I've got Windows running, I can't begin the driver installation.

Attempted Fix: Initially I got the message that I needed extended privileges to be able to access the installation setup, so I used the runaround (command prompt) to give it the privileges necessary to run the setup. The drivers appeared to install, but nothing really changed.

I used this runaround: http://joepetruska.com/wordpress/?p=208

However, I didn't have the file bootcamp64.msi, so I used bootcamp.msi. I checked all the driver folders, but I didn't see bootcamp64.msi.

Any and all help would be appreciated!