Converting hackintosh back into windows?

I don't know if this is the right place to put this but it seems like a sorta appropriate place.

So hackintosh stuff isn't my strong suit so I'm sure that what i want to do is simpler than I think.

Anyway we have this kinda old hackintosh that we used to use until we upgraded to an early 2009 mac pro. The hackintosh currently has El Capitan on it and we don't use it anymore. So I was wondering how you convert the hackintosh back into windows 10. I've looked around and all I've been able to find is dual booting which isn't what I want.

Any information on how to do this is appreciated!