Upgrading from 32 to 64 Bit Windows 7, without losing program installations/games [duplicate]
Solution 1:
Is it possible to perform an upgrade from 32 bit to 64 bit without this loss?
No. You can not upgrade from windows 7 32 bit to windows 7 64 bit.
You will need to reinstall the whole OS.
However you do not need to wipe all the old data. Move the downloaded installers (or the steamapps folder) to another drive (e.g. to D: or to an external drive), then reinstall windows on C: and reinstall the games from the previously downloaded files.