The graphics you have are fine for all normal computer usage, including watching movies.
It will likely run into problems if you try playing some of the newer action games.
If you are not a gamer, you are good to go.
I purchased a Dell dimension 4700 ( P4, 3Ghz, 1GB) recently which has integrated Intel graphics media accelerator 900. I have no idea how good or bad this graphic system is. I use my computer to watch movies (DVD as well as through internate)sometime. Can somebody tell me if I can get much better picture quality (movie) if I install other/another graphic card. If so, which is the best but cheap ??