If you wanted, you could do all the upgrading to make it better suited for gaming, but personally I would just invest into a laptop or a desktop. Netbooks aren't designed for very good airflow, and seem to overheat more often than not from what i've heard about them. Windows 7 starter is the lowest of the Windows 7 OS versions, but to upgrade to a higher version you would have to do some hardware upgrading as well... Better to just invest into a new computer if you are really interested in gaming (or your sister)