Everytime I try to open Minecraft through the Launcher it says "Couldn't extract files".

It also says I need more space on my disc. I deleted some useless files and tried to play again.

This time it worked. When I tried to join a server. It crashed. Tried again. It crashed. Again. Crashed. Again, again, again. Crashed, crashed, crashed. It never worked. Then it came up a weird message. That this was problary a bug in Java and that Minecraft tried to fix it but it maybe didn't work. And it said in the end "If this message show up again, please re-start Minecraft". I restarted Minecraft. And when I tried to open it again. It said I have not enough space on my disc. I was like What!Unable to render embedded object: File (??. I had space 1 minute ago. And now I don't) not found. I didn't download any files or anything at all. I just want to play Minecraft.