Honestly, when someone nags me in this way, it's usually because they simply don't want me to be on the computer all day long. Even if you can't go out and see your friends or it's possibly too cold to enjoy being outside, no one wants to see their kid playing MS whenever they turn around. Parents don't play MS with you - it's easy for them to look at it with disdain.
I suggest you grab a good book or series and read, read, read. Harry Potter, Artemis Fowl, whatever. Something you enjoy doing besides being on a computer that'll keep you occupied long enough to ease tension. This problem, like most Empty House issues, needs time.