Keyboard does not work after using Support Drivers

I have a Macbook Pro 4,1 15" 2.4GHz C2D, and managed to get Bootcamp installed on it with Win7 Home Pro. I have verified that it runs correctly, but it is missing many of the drivers needed to make things run smoothly. I no longer have my Leopard disks that the machine came, so I figured the WindowsSupportDrivers would be the way to go.

When I install them and reboot, the keyboard does not work. When I hit capslock, I get the caution notice indicating underneath my password field indicating the capslock key is on, so it's not like my entire keyboard is disabled. The system is unusable right now, since I have to enter my password to login, and it does not take any keyboard input. Using an external keyboard did not resolve this issue.

I did a system restore to get it back to a usable state for the time being.

Is there an alternative to the BCA support drivers or the Leopard disk? What's going on with my keyboard after the driver update?