My Asus laptop won't finish loading

Hello,

I have an asus laptop and it will let me log in but keeps giving me a loading circle and won't load. Last night it started doing this and told me I was low on memory. Then it told me there was a hard error. Im a dinosaur when it comes to technology but I have assignments that are saved on here that are due monday. It won't load anything and I have to have these assignments or my professors will fail me. Please help.