This machine is best left where it is. It's a single core CPU, and you would be unhappy no matter what the card or other upgrade.
Don't upgrade and save your money for the next machine.
Like the title says,I want to change my graphic card,I currently have an intel pentium 4,1GB RAM,256MB NVIDIA fx5500,3GHZ (processor)
Please tell me what are compatible graphic cards that will work fine with my configuration (note that I may be considering moving to windows 7 soon) and I sometimes play games and stuff,and I edit and watch videos alot,thanks for your answers !