You can't get a new video card, since the system doesn't have one (it's a chip soldered to the system board).

This system isn't designed for gaming - give it a break more often and it should run fine.

my D620 over heats when just on the desktop. I have had it for over a year and this has just started to happen recently. My whole keyboard will heat up and the bottom of my laptop is extremely hot and it slows down the whole computer down. can anyone help me with this?