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Upgrade 32-Bit (x86) Domain Controller to 64-Bit DC

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Last Modified: 2015-03-15
Hello Expert,
Management told me to upgrade the current domain controllers into the latest version ASAP, but I am very much confused because our current 3 domain controllers (DC1, DC2 and DC3) are 32-Bit windows 2008 Domain Controllers. My confusion is how we can convert 32-Bit windows 2008 Domain Controllers into 64-Bit windows 2012 domain controllers. Most of the upgrading documentation only explains how to upgrade 64-Bit windows 2008 Domain Controllers into 64-Bit windows 2012 domain controllers.
Please help me with a step-by-step process to upgrade 32-Bit windows 2008 Domain Controllers into 64-Bit windows 2012 domain controllers.
The current AD Infrastructure of our company consists of 3 Domain Controllers as follows:-
1)      DC01:-
      Server Name:-DC01
      Architecture:-Physical Server
      Operating System Installed: - Windows Server 2008 SP1 Standard Edition
      Server type: - 32-bit
      Antivirus Installed:- McAfee VirusScan Enterprise +Antispyware Enterprise
      Domain Functional Level:- Windows Server 2008
      Flexible Single Operations Masters (FSMO) running:-PDC Emulator and Relative Identifier (RID) Master
      Server Roles Installed:-
      DNS
      DHCP
      Global Catalog (GC)
2) CUDDC02:-
      Server Name:-DC02
      Architecture:-Physical Server
      Operating System Installed: - Windows Server 2008 SP1 Standard Edition
      Server type: - 32-bit
      Antivirus:- McAfee VirusScan Enterprise +Antispyware Enterprise
      Domain Functional Level:- Windows Server 2008
      Flexible Single Operations Masters (FSMO) running:-Domain Naming and Schema Master
       Server Roles Installed:-
      DNS
      Global Catalog (GC)
3) DC03:-
      Server Name:-DC03
      Architecture:-Virtual Server
      Operating System Installed: - Windows Server 2008 SP1 Standard Edition
      Server type: - 32-bit
      Antivirus:- McAfee VirusScan Enterprise +Antispyware Enterprise
      Domain Functional Level:- Windows Server 2008
      Flexible Single Operations Masters (FSMO) running:-Infrastructure Master
       Server Roles Installed:-
      DNS
      Global Catalog (GC)

Thank you for the excellent support we are getting from all the "Experts" from Expert-Exchange

Regards,
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