So I have a pretty old computer, about 10 years, and I really want to buy diablo 3 since I played the shit out of Diablo 2 for years, but after checking the requirements, I'm not sure if my computer can handle it, so I was wondering if anyone who knows about computer hardware or running Diablo 3 or preferably both could help. I just want to know if I buy the game I will be able to play it and if my computer will be able to handle the game without lagging. Also, I don't have the available space on my hard drive, so can I save the game on my external hard drive and still play it without problem?

These are the requirements
Windows