Hello and welcome!
How much would you like to spend?
Do you have a decent powersupply? i.e. What wattage is it rated at? If you need another card we need to be looking at 300 to 350w for a fairly low power card and then 400W+ for something with more oomph.
As you PC has no graphics card as is, I am wondering if its a barebones style with a 250w PSU in it. I hope I'm wrong of course.
