it’s been a few years since i messed around with windows imaging files (wims). here’s a quick list of diskpart commands needed to be ran to prepare a drive for the application of a wim file:

select disk 0
clean
create partition primary
select partition 1
format quick fs=ntfs
assign letter=”C”
active
exit

and then a wim can be applied with the imagex utility
source:  http://technet.microsoft.com/en-us/library/dd744531(WS.10).aspx