| 100% | VISTA | 5 | Operating system that succeeded Windows XP |
| 61% | UNIX | 4 | Operating system that succeeded TOPS-10 in usage |
| 58% | UNIX | 4 | Operating system that's an alternative to Windows |
| 55% | WHISTLER | 8 | Codename of Windows XP operating system |
| 54% | VISTA | 5 | Windows operating system after XP |
| 45% | UNIX | 4 | Operating system that was developed at Bell Labs |
| 45% | WINDOWSXP | 9 | Microsoft operating system that preceded Vista |
| 44% | PIE | 3 | Operating system that a lot of Android devices run |
| 43% | PCS | 3 | Machines that run the Windows operating system: Abbr. |
| 43% | GNU | 3 | Operating system that shares its name with an African mammal |
| 43% | YOSEMITE | 8 | Apple operating system that's also a geographical name |
| 42% | UNIX | 4 | Operating system analogous to Windows |
| 42% | UBUNTU | 6 | Linux operating system that means "humanity" in certain African languages |
| 42% | MSDOS | 5 | PC operating system before Windows (Hyph.) |
| 41% | VISTA | 5 | Windows version that followed XP |
| 40% | VISTA | 5 | Windows operating system released in 2007 |
| 39% | UNIX | 4 | Multi-user operating system analogues to DOS or Windows |
| 39% | CPM | 3 | Operating system that preceded DOS, created in 1974 and used on Intel 8080/85-based microcomputers |
| 38% | WINDOWS | 7 | Microsoft operating system that came out in 1985 and now dominates the personal computer market |
| 37% | CTA | 3 | Org. that operates the El train system |
| 37% | SEPTA | 5 | Org. that operates Philadelphia’s rail system |
| 33% | MSDOS | 5 | Pre-Windows operating system: Hyph. |
| 32% | VISTA | 5 | Windows XP successor |
| 32% | UNIX | 4 | Operating system since 1969 |
| 32% | DOS | 3 | Operating system for PCs |
| 31% | SPRINKLER | 9 | System that waters lawn |
| 31% | USENET | 6 | System that popularized ''FAQ'' |
| 31% | JOBROTATION | 11 | System that varies tasks* |
| 31% | OLFACTORY | 9 | System that controls smell |
| 31% | ANDROID | 7 | Operating system developed by Google |