Did you try resetting the BIOS to factory default?
Thanks... above helped... when searching on that forum I found someting about changing SATA from IDE to AHCI.
So in the bios I changed ...
> Storage Configuration > Change Configure SATA as IDE
... to ...
> Storage Configuration > Change Configure SATA as RAID
... and now it seems to work.
I used RAID instead of simple AHCI because I want to use raid0 (striping) for my paging disks.
So I will have a single disk for W7 Pro and use 2 disks for paging and cache.
My other 6 disks will later be used in raid3 on an areca controller.
Still working on my installation so I will leave this post open until windows 7 pro is installed / updated / configured.