My late 2009 MacBook 6,1 windows 10 is corrupted

I have a late 2009 MacBook 6,1 just for gaming purposes. I tried rolling back my system using system restore but unfortunately, my machine went off in the middle of the process. I got error code: critical process died and I think my windows 10 is corrupted. Currently I can't also access the macos partition(I don't know why. seems it just disappeared). Is there a way to freshly install or download windows 10 again when you can't get into macos ? Please help.