pwb.py somescript -generator

inside of my pywikibot folder

Now I reinstalled PC and I am not able to run scripts same way, i must type 

python pwb.py somescript -generator

I use windows 10

I have in path 

C:\Python\

C:\Python\Scripts\

and pywikibot in 

D:\pwb\

How to run it again without "python" prefix?

On my second PC it works.

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JAnD