TBH a 7300GT is not really a good gaming card either
Combine with your quite old platform, you would still not be able to play any newer games, even with everything lowered...
What you really need is an inexpensive platform upgrade.
Even a decent IGP will give you much better gaming performance than a 7300GT....
For about $275 you can get a new Athlon II x2 250
, ASUS 785G Motherboard
, 4GB DDR3
and a New PSU
I would recommend saving for a few months and getting something similar of a little better.