itunes match requires 64 bit

Itunes was working fine but I have purchased itunes match to put all my cd's to the cloud, so when I attempted to add my current Windows 8 computer to match itunes told me that i was using a 32 bit version and needed the 64 bit to have this computer on added, I can only find the download for itunes6464 which is the version that was not compatible.Any help would be appreciated.