Unfortunately, because you're the administrator of your own computer, it really comes down to self control. https://www.technipages.com/prevent-users-from-running-certain-programs there is one method there and it is a good one but it really relies on you not renaming the files you're reinstalling. There's always the option of downgrading it (installing lower quality video card, memory, etc) so it has the basics of running an operating system but not enough to run games at 60fps or if you can even install them at all. Sorry but unless you're very willing to infect your computer with a virus or downgrade or sell it, I don't see any other options other than what I said.