Stripped screw in dell inspiron 15 3521 need help.

I had to replace the touchpad on my laptop. Anyway I have one screw that wont come out It just spins and I have one screw that wont go back in. The hole that wont take a screw is at the upper right corner second from the top.  I need to fix the screw because I wont be able to get back into the laptop in the future with this problem.  these are the screws on the back of the laptop. Please help.