Windows 7 Freezes at "Completing Installation"

Question

So, I was installing windows 7 and everything was going great, fast, etc. Computer had just restarted, blah blah. Windows had said "Upgrading Registry and what not" and then when I got to the "Completing Installation" after about 5 minutes it just freezes, I gave it a good 20 minutes of just sitting there before coming to the conclusion it might be a hardware problem?
Then again, why would I get so far in the installation before it doing that? It was at about the 70% marker.
Btw, I'm upgrading to Windows 7 32bit, I'm running Vista 32bit atm, and Vista is freshly installed after a Hard Drive format about a week ago.
Soes any help would be great, if it matters any deal about my computer specs I'm on:
- AMD 64X Dual Core 3.00ghz.
- GeFORCE XFX 6600 512mb
- Default High Def Sound Card
Running a HP PC, but would have really matter?
Anyway, if anyone has any fixes for this or solutions, suggestions, what ever have you, I'm interested.
And also, I should note that I've tryed installing 3-4 times now with the exact same outcome.
I've tryed just the "Update" option, then after that I tryed the "Custom" option in the installation while it was already booted up.
Would a clean installation be the possible fix? The reason I haven't tred I clean installation is cause I just reinstalled Vista and formatted my hard drive a week ago meaning I'd have to make a 100gig backup of my programs, but if doing a clean sweap would have a 100% success rate, I'm all in.
Oh, one more thing, I first tried writing a CD with a RW DVD but I've tryed with 2 different types as well all going at 2x write speed. I still get the same installation Freeze.

Answer 1

I am glad to say that issue solved! Thanks a lot to all of you from that forum, but key problem solver was a guy Alex from MS Technical support.
 The problem has been solved after disabling video card in device manager. I was scared to do that before. I believed that this will lead to “no video” situation since I have only one vide card. In fact that action disabled
only driver.
So the successful installation steps were following:
1.      
Minimize comp configuration:
Only 1 HDD;
Only one chip of RAM (4 G in my case);
Only PS2 keyboard;
2.      
Optimize HDD as recommended at :
(http://www.sevenforums.com/tutorials/91339-ssd-hdd-optimize-windows-reinstallation.html)
3.      
Run complete installation up to the “Completing installation step” freeze.
4.      
Activate Computer Manager as described by SheilaP at
http://social.technet.microsoft.com/Forums/en/w7itproinstall/thread/7d765b66-17c6-46e8-94e2-dd39b5b504c1?prof=required;
5.      
Disable all devices with “!” mark and video card also (even if it doesn’t have “!”, as it was in my case). Continue
the installation.
Again special thanks to :
Bare
Foot Kid from http://www.sevenforums.com;
SheilaP from
http://social.technet.microsoft.com/Forums/en/w7itproinstall/thread/7d765b66-17c6-46e8-94e2-dd39b5b504c1?prof=required;
Alex from MS Technical support.
Sincerely,
Michael