Windows itself is using part of that memory and it's always going to. It's not that you don't have the memory. i.e. you didn't come home and find that you don't really have 512. Yes, you do. It's on the motherboard and it's there. Memory is used to run programs. And Windows (and all its extraterrestrial components) is using part of it just to run. Windows is a program too. That's what the memory is there for. Windows gets first dibs so that your computer can even run, and then the rest of the programs can fight over the rest while they are trying to run. You're trying to get that entire 512 and it's never going to happen because Windows needs some.
Programs take up drive space just to exist and sit there, but they use RAM when they are running. When they stop running, they aren't using the RAM anymore. (Theoretically.) I don't know if this analogy will make sense. But your body is taking up space. If you gained weight, you'd take up more space. If you chopped off a leg, you'd take up less space. But your brain (RAM) is used when thinking. When you're asleep and not thinking and doing stuff, you're still using a little brain power just to run some bodily processes and as long as you're alive, that will never stop. So that part of your brain will never be available for thinking. If you are awake and thinking about something, you're using more brain power. You can only think of so many things at once. If you tried to do too much at once, you'd probably get all confused cause your brain can't handle it. But chopping off your leg to take up less space isn't going to enable you to think about any more things at once, nor is it going to stop that part of your brain which is always needed to run those bodily processes.
If this new thing you're trying to download says you don't have enough memory, then you simply need to get more and that's all there is to it.
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