I found a link on the page you gave me a link to... showing a workaround on the BootCamp build in problem with x64 Window systems!:
Windows 7 beta and Alum Macbook (bootcamp) - Mac Forums
Couldn't make it work
Only got a error box saying something about an errorcode 2229 (Whatever that may be!??)
I then tried another suggestion from one of the comments to the page you linked to... saying:
If you install windows 7 x64 on any iMac and want to get the bootcamp drivers working, do this:
copy and paste the bootcamp folder onto your desktop from windows. download an MSI editor such as ORCA and open the bootcamp.msi. Then right click on the table that checks operating system and then save the file. after that you will be able to install all the bootcamp drivers onto any sort of mac you have and not be limited to x64 only on macbook pros and mac pros. <3
Couldn't make that work either... didn't make much sense with the right click and save thing...
Please help!!!