[QUESTION] Re-activate after reinstall from x64 down to 32 bit

Here is the case. I am sure that some one here has been there done that. I bought 2 legit keys, one for a 64 bit windows 7 machine and one for a 32 bit laptop.
Without knowing that the upgrade DVD is different for each computer, I used the same DVD burned from the 64 bit machine to upgrade the 32 bit laptop. Now the laptop is activated with a 64 bit windows 8.

What should I do if I want go back to 32 bit on the laptop, besides using the proper upgrade DVD, do I have to do phone re-activation?

Thanks ahead.

 

Well, two things:

1. It's an old laptop Dell M1530 has only 2 GB of memory installed.
2. I had an activated office 2010 MSDN version installed with windows 7. It's now become inactivated with windows 8. Using token manager failed. This MSDN key is no longer valid if I re-install Office 2010 fresh.
Of note, in the 64 bit PC, the MSDN office 2010 remains activated after upgrading to windows 8. I guess in the laptop it could be because the change from 32 bit to 64 bit windows.
I want to try if by downgrade back to 32 bit windows 8 then I can have activated office 2010 again. Or else I have to go with office 2013 or revert back to back up copy of windows 7.

 

@ wiryawang & rrohela

So what I understand is windows 8 activation is the same for 32 and 64 bit. I will try and report back. Thanks mucho folks