I recently ran into this problem on a machine here and investigated it this morning. On our machine the problem was caused by driver software for the Intel Management Engine, which puts a DLL into the system path that it shouldn’t do. As I wasn’t using the management engine, I uninstalled the software and the problem in Mocha went away.
Reading around the issue, this could be a problem for any software that includes a Python interpreter.
(Technical info here: Stack Overflow: Runtime error R6034 in embedded Python application)
When I tried to reproduce the problem again by reinstalling the management engine driver from the website of the motherboard manufacturer, it no longer installed that problematic file. So my guess is they have released a newer version which solves the problem.
I suggest you try to uninstall then download the latest version and reinstall the Intel Management Engine software on your computer, this might solve the problem. If you’re not actually using it, you could also just leave that software uninstalled.