Answer by TheTechDude · Feb 24, 2012 at 11:30 PM
Mine says the same thing it is because it is build on the 6.1 version of the Windows Kernel. Windows XP and 2000 were both 5. somethings. This is how Windows is designed. It is the same with Mac OS, the "X" means that it is the tenth version and has been for sometime, they were on 9 before that.
Answer by nickjuly4 · Feb 26, 2012 at 09:12 PM
Because Windows 7's version is 6.1. They should have changed the version to 7.0 but I guess they didn't want to mess up their numbering conventions or something, and also couldn't think of anything else to name it.
Also Vista is 6.0, not 6.1.
Windows 95 (and Windows NT) - 4.0
Windows 98 - 4.1
Windows ME - 4.9
Windows 2000 - 5.0
Windows XP - 5.1
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