Install WIN 8 128 bit over 64 bit? - Windows 8

Hi guys,

Is it possible to install WIN 8 128 bit over 64 bit? does anyone know?

It seems that I can't able to "upgrade" Windows 8x128 over 64 bit. During the upgarde, I get a message box telling me "the installation disk isn't compatible with your version of Windows" .

does anyone seems to have encountered the same? hope you can fix this and many thanks in advance.

BUMP
I am having similar issue. I want to go from x32 to x64 but I cant because it says:

"The version of this file is not compatible with the version of Windows
you're running. Check your computer's system information to see whether
you need an x86 (32-bit) or x64 (64-bit) version of the program, and then
contact the software publisher."

Never-mind: Found the answer, I can't be done. Install new OS from Boot.