I have both versions installed, and have the exact same hard drive rating in each. (3)Bad rate experience in hdd its more notable in the x64 beta version of w7,...
Open the Device Manager and open the Disk drives.
Right click the drive(s) and select properties. and then the policies tab.
Untick the two squares (Kyles earlier posting suggested ticking) Now reboot and run the WEI again. This is only going to work on IDE drives.
In most cases you will get a much higher score. You can tick the two items again, and it will not influence your score.
That worked just like you said. Interestingly most, maybe even all, of my scores are now higher than they were under Vista with the same hardware.