the code shuts down the websites from 0800 hours to 1600 hours.
modify the code as directed in comments.

run the script with administrative access. --> open cmd with administrator and then run it.

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To run this in background process :

change the extension from 'py' to 'pyw' --> "code.py" to "code.pyw"
then simply open it with ADMINISTRATIVE ACCESS 
--> blocker.pyw is an example. Just run it with administrative priveleges.

Schedule it task scheduler -> see it from google or youtube.