I know nothing about the DP55WB & It has been awhile since I loaded W2003, but I seem to recall that pre - SP2 all kinds of issues occured with RAID controllers.
A lot of servers products required that W2003 had tro have SP2 slipstreamed into the CD inorder to load.
Looks like that did it. I slipstreamed SP2 into the CD, and Setup s now getting past the screen where it was freezing yesterday. So here's hoping...