Windows ME by far. But some might not be old enough to remember Windows 3.0 (Microsoft first widely accepted GUI OS). It was cool back then because its all we had except for Apple, Commodore, and Tandy 1000. However, in comparison of OS's it falls far short of what we have today. If I remember correctly it ran on a 16-bit machine with maximum of 16MB of RAM (yes I said megabytes). Windows 3.0 was awfully slow, but it was the best OS of its time --- that's why I'll have to stick with Windows ME, because even though Windows 3.0 is way worst than ME it still was the best during its time. Windows ME sucked during its time and still sucks today!!! lol
