Reboot the rig using the Windows DVD.
Restart installation Process.
When it takes you to the window where it asks for the disc on which you need to install windows, click on advanced hard disc options.
Under that you will see one 100MB partition reserved for the system and the other drive partitions.
Click on the 100MB Partition and delete it, confirm as unreserved/raw space.
Click on the drive partition you want to instal windows on and delete it.
Confirm that that space plus the 100MB partition have both become one single RAW un-partitioned space.
Then click on the partitioned RAW space now created and select it to install windows on.
It will ask you , that it requires 100MB for installing windows as systems space, confirm and say yes.
Let it do the rest.
You shall hopefully not have any problems.
Thank you so much for this post. It was the key to installing windows on my new build. /cheer