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What is your QHOME variable set to?
C:Users>echo %QHOME%
C:q
You may need to set it to the correct folder location. It is also helpful to add q to your PATH while you are at it:
C:Users>setx QHOME “D:kDBw64”
C:Users>setx PATH “%PATH%;D:kDBw64w64”
Full installation instructions here: https://code.kx.com/q/learn/install
(Being pedantic, you can also remove the top level w64 folder in order to neaten up the environmental variables mentioned.)