INTEL to AMD Windows Boot Fail

You forgot one thing! Once you make a major hardware change a clean install of Windows is just about always a mandate to see the best results! You can however try the Repair Install method to see if you could save the existing copy of Windows but may likely run into any number of possible problems between lingering device drivers for hardwares and chipset no longer seen as well as other things!

The best practical advice anyone can give you for this however is still to see a Clean Install Windows 7

AMD64 is what you would expect to see after 2003 and on. That has nothing to do with the OS itself but supports the 64bit OSs. The Repair Install option would upgrade over the existing installation to refresh all system files while keeping programs, files, folders, and unfortunately the now no longer wanted existing drivers inplace!

The first thing you can do if the Startup repair isn't able to get you upto the desktop where the "This may be a counterfeit copy of Windows" will likely now being found in the lower right hand corner of the screen since the hardware profile has been changed would be uninstalling what you can as far as the old board drivers in particular before trying install anything new.

When upgrading a case to that extent it is just as if you built an entirely new one! Likewise over the summer months I finally got around to swapping out the main board, cpu, memory, keeping the old video and sound cards, and added in a brand new supply which then required a full clean install of Vista for that.

The first thing you can do in the meantime if you go with the upgrade to repair method would be making sure you back everything up you can to another drive in anticipatation that a clean install may be forced on you if the upgrade over plus new hardwares end up seeing too many errors. That's the drawback of making a large change like this without planning ahead where the best possible formula is total wipe, start over fresh!

Now for simply performing a clean install without a reformat the Windows.old folder will pack away most of your user files and other things there. You can make a backup using the Windows Easy Transfer tool prior to any clean install and see that restore user files as well as program settings once Windows and all programs are back on fresh.

Method One in one of the guides here at SF explain how to use the Sysprep tool for moving the hard drive with 7 already installed into a new system. In an actual sense you have already done the move as far as the hardware changes but would have been better off using the Sysprep tool before the swap was made as you can see in the first part of the guide seen at Windows 7 Installation - Transfer to a New Computer

The WET however can still be used for the user files and setting to preserve those elements while a manual backup of other things not found under the "C:\users\" directory will be needed if the repair should falter on you. If you are put in the spot of performing a clean install from scratch once everything is back up and running again that would be the time for one other backup option to consider. Backup Complete Computer - Create an Image Backup

EDIT: Hold tight, I think I've got it working. i'll update again shortly.

You have to run the upgrade advisor to find out where the hang up is being seen if you are still running into any problems. Download Windows 7 Upgrade Advisor from Official Microsoft Download Center

It certainly won't be anything hardware related if no faults are present since I dropped a fest temp install of 7 on an old boat anchor and the 32bit flavor ran first on 512mb until the pair of dimms saw the contacts cleaned and were reseated to get the 1gb total. A look at the memory dump for the blues you had could also be a help.