Q: If I install windows with bootcamp can I and if so how do I uninstall it

I am looking to download the Windows OS for the purpose of gaming, I haven't heard great things about windows 10 or 8.1. The best options i have seen in terms of purchasing are in windows seven but those are meant for refurbished PCs and are not able to be upgraded to the newer versions of Windows. So i was wondering if I get Windows seven to run with the use of bootcamp will i be able to uninstall it in order to install a better version of windows if and when it is available. Or simply because i no longer wish to use up computer space with an OS that I no longer use if that should occur.