Replacing My Old Video Card

For months now, my computer is up for repair. I've replaced some of its parts already and now, I was just informed that another one is to be replaced. First, it was the motherboard and then, the power supply and now, the video card. I just want want this old computer to run because i am comfortable using it. I don't want to another new computer because I've just had a new computer assembled a few months ago. so much for my meager savings. I have to buy a new one later and hope that this would be the last defect that i will encounter.