Microsoft publishes generic keys for installing the OS, but they cannot activate online. Example of a non-activating generic key for Ultimate: J782D-6XK7F-4YQH4-DVY9F-R7YJM (Do not use this expecting activation).
Instead of hunting for a Windows 7 Ultimate 32-bit key today: windows 7 product key ultimate 32 bit
Here are some common issues you might encounter with Windows 7 Ultimate 32-bit product keys: Microsoft publishes generic keys for installing the OS,