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64bit XP & Vista are not supported for the FW installer, 64bit Win7 is fine.
Download the FW, run it, turn on your Nex-7, go into the menu, head into settings, scroll down to usb, set it to mass storage, plug it in, check that the "Safely Remove Hardware" icon is in the task bar, if it is you're golden, just follow the updater prompts.
refer to here for win
Actually i could not get it to run on my windows 7 64 bit , but had no problems on my Vista 32 bit.Record button has been officially turned off.