I have a situation very much like the one at ImportError: DLL load failed: %1 is not a valid Win32 application, but the answer there isn\'t working for me.
My Python
I experienced the same problem while trying to write a code concerning Speech_to_Text.
The solution was very simple. Uninstall the previous pywin32 using the pip method
pip uninstall pywin32
The above will remove the existing one which is by default for 32 bit computers. And install it again using
pip install pywin32
This will install the one for the 64 bit computer which you are using.