run python file on background and start on windows boot

[buran]

you can go with bat file, as suggested
or you can just create a link (shortcut)
Right-click -> New -> Shortcut

In the window that opens, write (or browse to find) the path to your python.exe. That will be in the top folder where you have installed python. Add full path to your script. So it will look like
c:\python3\python.exe c:\pathtoyourscript\yourscript.py

on the next window name your shortcut whatever youlike