hey, thanks, this worked great... just copy that command into a notepad first, it has a few extra carriage returns in it that prevent you from being able to copy and paste it into the command prompt, and be sure to run the command prompt as admin.
Funny, I wonder if this is a service pack issue - same exact hardware it installed no problem with 2008R2 Standard, but on a 2008R2 Standard SP1 it failed, luckily, your solution helped me win!