Your current motherboard has a Integrated card, the 7025, but you do have a PCI-e X 16 slot, so you can run almost all the cards released, if you have a good PSU. The CPU is okay as well. You may want to add another 2GB stick in there to make it a total of 4GB, that is , if you're running a 64 bit OS.
1) What's the brand name on that PSU and it's model number ?
2) Which OS are you using ?
See a box written 'VX450W', that's a PSU. It can either be on the top or bottom.
You've got to look for the brand on that box and also look note down the power ratings and specifications on a label that's stuck on your PSU.