Yes i wish to game with it. I already tried to buy a power supply but it was not compatible because the computer has a certain plug inside which the supply did not have.Not trying to be rude, but it's some common sense based on context clues. PCs are only as hard as you make them, because they are very simple. Mid tower, mid sized box, ultra slim, small box. Eh.
Anyways yes the PC is worth upgrading. Can't recommend a PSU until we know what you intend on doing with the machine. I assume gaming, but that is largely dependent on what GPU you want to buy.