| 100% | WINDOWS | 7 | Microsoft's PC operating system |
| 66% | LINUX | 5 | PC operating system |
| 63% | MSDOS | 5 | PC operating system before Windows (Hyph.) |
| 60% | DOS | 3 | Operating system for PCs |
| 54% | WINDOWSXP | 9 | Microsoft operating system that preceded Vista |
| 52% | DOS | 3 | Early Microsoft operating system |
| 52% | ANDROID | 7 | Google's smartphone operating system |
| 52% | IOS | 3 | Apple's mobile operating system |
| 49% | IOS | 3 | Operating system for Apple's mobile devices |
| 48% | UNIX | 4 | Operating system that's an alternative to Windows |
| 46% | IOS | 3 | Apple's operating system |
| 46% | IOS | 3 | iPhone's operating system |
| 45% | WINDOWS | 7 | Microsoft operating system that came out in 1985 and now dominates the personal computer market |
| 45% | YOSEMITE | 8 | Apple operating system that's also a geographical name |
| 44% | IOS | 3 | Popular mobile phone operating system |
| 44% | WINDOWS | 7 | Very common computer operating system |
| 44% | UNIX | 4 | One of the operating systems |
| 43% | UNIX | 4 | Operating system since 1969 |
| 43% | ANDROID | 7 | Commander Data; operating system |
| 42% | ANDROID | 7 | Google's robotic mobile operating system |
| 42% | ANDROID | 7 | Operating system developed by Google |
| 42% | UNIX | 4 | Operating system analogous to Windows |
| 42% | UNIX | 4 | Operating system with many clones |
| 42% | UNIX | 4 | Operating system in many servers |
| 42% | UNIX | 4 | Computer open-source operating system |
| 42% | UNIX | 4 | Operating system since the 1970s |
| 42% | UNIX | 4 | Operating system since the '70s |
| 42% | SOFTWARE | 8 | Operating system of a computer |
| 42% | UNIX | 4 | Operating system since the '60s |
| 42% | ANDROID | 7 | Operating system for Galaxy smartphones |