When you say can it be got from anywhere, if i think its what im thinking then no i dout it, you will have to buy it, but then im not sure how your card would fair, i know it definatly wont run on highest settings, maybe medium/low.
A safer bet would be doom3 or quake 4, there not so system hungry as it were.
And if your old card was ATI then i dont think you need to uninstall any drivers, just check on ATI's website that your currant drivers also support the x1300.
Certainly the catalyst can stay, thats the same whatever make of ATI card you have