Graphics not working correctly after install Win7 via BootCamp?

I recently purchased a mid-2010 (MC516ll/a, or Macbook 7,1) White macbook. I installed Windows 7 Pro (x64) using boot camp mainly for the purpose of gaming, but as I start to install things I'm noticing some strange happenings. Mostly, it seems to not know about the graphics card, or something along those lines - for instance, on my old 2006 macbook with a 128MB GMA intel integrated chip, I had a game (Lugaru) that ran with only a little bit of lag on highest graphics settings, but on this device (with an 256MB 320M (?) GeForce chip), the menu screen alone runs at ~2FPS, and it can't even load a level. As another example, a game with ridiculously low graphics requirements (Battleships Forever), say my computer doesn't meet the required graphics requirements.

I restarted to make sure it wasn't a rebooting issue, and found, strangely, that Windows had to reinstall the drivers for the mouse I have (after it already installed them once before reboot). Not sure if that's related. Also not sure if it's related, but Game Maker: Studio 1.2 won't open. On the mac partition I am running OSX Mavericks. I ran into a couple bumps while installing Win7, more specifically: (1) The computer came pre-partitioned into the boot drive and a system restore drive. I had to remove the latter (after making a dmg) in order to partition for Win7. (2) When I tried to install the boot camp drivers using setup.exe, it (wrongly) said that the computer doesn't support x64 Windows. I had to use a workaround where I used cmd.exe in administrator mode to open BootCamp.msi in the drivers folder (a solution I found on the internet).

Has anyone else experienced this and/or have a solution?