I am trying to install Orange and it throws an error message saying that python.exe was not found. I already have python installed. I am wondering what is the problem. 
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I suspect it's looking for Python either in the system path or in the registry somewhere - probably the latter, and getting an empty string when it was expecting a path. If you want to debug this yourself I'd try using [procmon](https://learn.microsoft.com/en-us/sysinternals/downloads/procmon) with the installer running to try and see how it's trying to detect Python. However procmon is very noisy so might take a bit of work to filter down the data to the bit you need. – Rup Apr 13 '20 at 12:07
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Or there's instructions for checking / fixing the Python registry entries here: [How to add Python to Windows registry](https://stackoverflow.com/questions/17872234/how-to-add-python-to-windows-registry) – Rup Apr 13 '20 at 12:08