Loss of available RAM in Windows 7 partition

I have a Windows 7 partition set up under Lion OS. The iMac has 8Gb RAM. However, in the Windows partition I only get just over 2Gb available and 5.1Gb is 'Hardware Reserved' ! Any ideas how I can reduce the amount set aside as 'Hardware Reserved' ?
When running under OS, I have typically 6.3Gb free !

As a person running Windows 7 64-bit under boot camp on a machine with an ATI Radeon 6750M, I can testify that at least that setup works fine. I don't see how a format and reinstall could break any particular element of the new install.
If your machine is anything but a Mac Pro, please ensure you're using the Boot Camp drivers Apple provide rather than the ones you get off ATI's website — the latter will refuse to recognose your card.
If you don't already have a copy, use Boot Camp Assistant to download the Boot Camp drivers for your particular machine.

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