The physical condition of not being able to stop shaking your fists in the air in utter frustration when forced to use Vista.
I thought Keith was really upset when I walked into his office and he was crazily shaking his fists in the air; turns out he had just received his new laptop and immediately contracted Vistalepsy.
n. software that is no longer sold or supported by the original publisher / developer, often found as free downloads on the internet because it cannot be obtained elsewhere. Not legal, but often seen as morally acceptable because the company that made it is no longer selling the title, nor releasing it as freeware, therefore abandonware is "keeping the gamealive", so to speak.
Doom II is not abandonware because idstill sells it, while The Incredible Machine is not sold, therefore is abandonware.