Mini Mac running Windows 7 won't use more than 2GB of RAM.

I used Bootcamp (newest version) to install Windows 7 Ultimate on my partitioned hard drive on my Mac Mini. The computer ahs 8GB of RAM, but when I open the Task Manager in Windows, I can only see that 2BG of RAM is being used. How can I get it so that I can use all 8GB of RAM on Windows 7? Is there any possibility that I could do it without having to reinstall Windows?

All I would like to know is how I can get Windows 7 to use all 8GB of RAM. I did install the x86 version.

Thannk you.

Quick edit: I can see that the task manager sees that 8GB are installed, but it also says that there is 2GB total. The OS is only being run with the 2GB and not the 8 that are being detected.