I have seen the following issue posted a few times now
Directly after the first restart the installer hangs on “Completing Installation”
I have installed Windows 7 on all of my machines (The RC 7100 build) ranging form Netbooks to Quad-Core powerhouses with 8gigs of RAM. Recently I ran into this issue and figured out what I was doing wrong after 2 failed attempts.
On the “Where do you want to install Windows” page I was just formatting the partition I wanted and clicking “Next”
THAT IS WHAT I DID WRONG!
I did the following and it was smooth sailing from there.
DO NOT just hit “Format”
“Delete” then “Allocate”
It will then create 2 partitions.
Par 1 – Will be called “System Allocated” and only be 100mb ( This was the key )
Par 2 – Will be your new OS volume
( You can also just leave the area “Unallocated” and click “Next” )