Okay I heard back from ASUS and like I figured they bowed out of the problem.
"At this time we cannot offer support or troubleshooting help for Windows 7, and we may not have official, stable, non-beta drivers available for your board until the software is finalized (ie; no longer in Beta/pre-release status, as a driver/app for one build often won't work correctly with others, necessitating driver testing for each pre-release build isn't feasible). You will either need to contact Microsoft for troubleshooting/driver assistance or install a supported OS on the board (XP/Vista) in order for us to be able to assist you with any problems you may have."
I've loaded many things onto Win7 with no problems except this one. I'll probably submit the same ticket again only as a Vista x64 user to see if they come up with any useful tips.
Will advise...