Re: Will I be able to upgrade this computer?
Yes, changing the CPU and the video card is feasible on this HP machine.
Later add dedicated graphic card so you can play more larger games.
When changing a CPU(may get up to AM3 x180,please check with HP for the fasted speed CPU acceptable), try add more RAM with 800mhz speed, this is important, using the different speed RAM may cause no POST screen and may not fit the RAM slot.
Hope this helps!