| 100% | WINDOWSXP | 9 | MS operating system launched in 2001 |
| 45% | XBOX | 4 | Microsoft product launched in 2001 |
| 44% | UNIX | 4 | Operating system in many servers |
| 44% | UNIX | 4 | Operating system written in C |
| 43% | UBUNTU | 6 | Operating system in the Linux family |
| 42% | UNIX | 4 | Operating system that succeeded TOPS-10 in usage |
| 41% | DARWIN | 6 | Mac operating system first released in 2000 |
| 40% | VISTA | 5 | Windows operating system released in 2007 |
| 39% | UBUNTU | 6 | Linux operating system that means "humanity" in certain African languages |
| 39% | UNIX | 4 | Computer operating system developed in the nineteen-sixties |
| 38% | SCLEROSIS | 9 | S in the immune system disease MS |
| 36% | CPM | 3 | Operating system that preceded DOS, created in 1974 and used on Intel 8080/85-based microcomputers |
| 35% | WINDOWS | 7 | Microsoft operating system that came out in 1985 and now dominates the personal computer market |
| 35% | MARSODYSSEY | 11 | NASA's unmanned mission to the Red Planet launched in 2001, named in honor of an Arthur C. Clarke novel |
| 34% | DOS | 3 | MS-___, '90s operating system |
| 33% | ORBIT | 5 | Sugarless chewing gum from the Wrigley company re-launched in 2001 |
| 32% | UNIX | 4 | Operating system since 1969 |
| 32% | DOS | 3 | Operating system for PCs |
| 32% | ENRON | 5 | Company that went under in 2001 |
| 32% | ENRON | 5 | Noted declarer of bankruptcy in 2001 |
| 32% | IPOD | 4 | Apple device first released in 2001 |
| 32% | IPOD | 4 | Portable music player introduced in 2001 |
| 32% | AMANA | 5 | Company acquired by Maytag in 2001 |
| 32% | MRPIBB | 6 | Dr Pepper rival renamed in 2001 |
| 32% | GAMECUBE | 8 | Purple Nintendo console released in 2001 |
| 32% | IPOD | 4 | Digital music player introduced in 2001 |
| 32% | ENRON | 5 | Company that went bankrupt in 2001 |
| 32% | TWA | 3 | Carrier acquired by American in 2001 |
| 32% | IPOD | 4 | Personal music player introduced in 2001 |
| 32% | IPOD | 4 | Music device that debuted in 2001 |