How to uninstall Win 7 32bit from old PC and install 64bit in a new PC

Hi,
I have Window 7 Ultimate official box set and installed the 32bit in my old PC few years ago, it was fine till recently the hardware failure from time to time, so I bought yesterday a new set PC (DIY) without OS.
Now I want to transfer the Window 7 license to the new one but use 64bit version. I fully understand the license key only work for 1 PC, therefore I intend to deactivate/ uninstall 32bit in old PC, and use the same key (I read your forums and it should work) for 64bit in the new PC.
Could anybody help to let me know the procedures for deactivate/ uninstall the 32bit from the old PC? prefer step by step, as I am not good at such modification work.
I wonder this procedure should not just been done in the old PC only, I expect it should use LAN connect to Microsoft Web somewhere, to let their product key register servers know that I did uninstall 32bit, so that the product key will be valid again. Please let me know the procedure of that and is this connection/ register servers are regional related (i.e. globally all in US MS HQ or in local MS office Asia)?
Moreover, I believe the installation of 64bit in new PC just like the fresh new installation. Load the software and key in the product key to complete. If any problem or points need to be noted, please kindly advise me as well.
Thanks for your help.

Hi Dcksony,
first of depends on your licence, is it
OEM -- (including system builder) then its not possible to transfer it to an other comp.
Retail -- no problem at all, just download the OS from MS (to a disc/USB)

notes
if you only have 2GB ram then only the 32 bit version will work properly
your original box set SHOULD have had both versions included
MS does NOT care if its 32 or 64 bit the licence is valid for both installs.
if you do not know what type of licence you have read this tutorial and post the output
Windows Genuine and Activation Issue Posting Instructions


Answer the above then i can give you more information.

Roy

Hi Roy,
My Window 7 sure is Retail license, the box set has 2 CDs, 1 for 32bit, 1 for 64bit and with a yellow color product key. Old PC has 4x1GB RAM and the new PC has 2x8GB RAM.
Thanks,
Dickson

Well thats really good news,
The only thing you >>might<< have to do is a telephone activation. But if you tell them what you told us you wont have a prob.

note you cant have two running at the same time, just wipe the 32 bit with a linux os

Roy

Dear Roy,

Idid try the last weekend. I pull out the LAN from old PC and connected to thenew PC, then I put in the window 7 x64bit CD and start the installation.After completion, the window detect the LAN setting and it automaticallyactivated.

Noneed to contact the phone activation and I re-format the old PC to ensure1 key 1 PC.

Thanksfor your help and now my problem gone.

Thanksso much.

Dickson