Window won't go up

My back driver side window won't go up.

It will go down using the driver and back switches but when putting it up, it will jolt/move slightly and then will make a slight sound and then nothing. It did go up once by pushing it up with my hands on the window but now it won't move past a certain point at all. When it was 'up/closed' before this, it never completely closed and would fall down slightly itself and I had to push it close with my hands on the glass.

Any suggestions? Thanks!