You can't upgrade a 32 bit version to 64 bit, but you can install the 64 bit version in a new partition giving you a dual boot configuration where you can access the 32 bit files from the 64 bit partition.
I installed windows 8 32 bit by mistake and wish to convert my OS to the 64 bit version. (My pc is x64)
I have the CD of Windows 8 Pro. One CD for the 64 bit version. However when I click on the CD app to start the set up it says that windows will not run the file.
The CD wont auto run either.
How do I upgrade ?