Whenever I try and go on a server my game crashes.And eventually when I play on singleplayer it crashes too.

So I go on to multiplayer I press a server it loads for quite a few minutes then says joining world then saving world then it goes back to the launcher and says an unexpected crash has happened.

And for singleplayer I go on any world and I play for a bit then it crashes.

Extra information

I have a windows 7 which is the oldest computer and my account is masteraqil06