OK well, the CPU in this computer is one of the weakest that AMD made, and it's a single core. So, no matter what you purchase in the way of a video card, the CPU will be a "bottleneck", when used with most of today's high requirement games.
This is an older iteration on the MCP61 chipset, as it has DDR2 memory instead of DDR-3/
No matter, as Leeky suggests a picture of the motherboard would be most helpful.
However, we could still easily obtain some more useful information from SIW.
In the left menu pane, go to the "hardware" section, (expand "hardware" if it isn't already). and upload the results from the following options
1....."Motherboard
2......"CPU Info"
3....."Memory" and finally;
4......"System Slots"
If you like, also click on "Video" and that will tell us what's already installed. However, I suspect that your machine has integrated graphics.
Given the age of this computer, replacing the power supply is almost going to be mandatory. The machine is in a lower price bracket, and in those cases, not much thought is given to power hungry upgrades such as video cards. Plus, unless your PSU has been replaced recently, age kills capacity, and it's entirely possible that it doesn't even meet its published specs.
(Don't feel bad. Some higher priced machines don't either).