Wait a minute. What do you mean with this "Processor: Intel(R) Pentium(R) D CPU 2.80GHz (2 CPUs)"?
2 CPU's or a dual core?
And second, the processor is way more important than memory and graphics card.
Third, the games you tried are not working well with the emulator yet. They are marked as "ingame" on the
compatibility list. This means: "You can get through menus, intro cutscenes / videos, and see ingame graphics, but either due to graphical bugs, crashes, un-resolved errors, you can't play through the entire game."
If you indeed have a dual core processor it might be an idea to try a game that is actually known to work. However I don't know anything about your graphics card so that might be too weak. And the memory should probably be upgraded.