Just a little side note involving the sequencing of the versions of Windows 7, 8, 8.1, 10
Its named windows 10 'cause it has to do with the new series 'new generation' of windows and the new version sequencing that started with Windows Vista....
The major and minor versions (used by the operating system internally) are combined to get the collective version numbers. For example, the Windows 7 major = 6 and the minor = 1, so you end up with (starting with Windows Vista) ...
Windows Vista = version 6.0
Windows 7 = version 6.1
Windows 8 = version 6.2
Windows 8.1 = version 6.3 <<< this was never planned to be, read below
Windows 10 = version 6.4
The major added to the minor gives the version numbering sequence for the current 'new generation' round of Windows, so for example, Windows 7 major + minor = 7 (6 + 1 = 7).
So we end up with:
Windows Vista = version 6.0 (6 + 0 = 6)
Windows 7 = version 6.1 (6 + 1 = 7)
Windows 8 = version 6.2 (6 + 2 =

Windows 8.1 = version 6.3 (6 + 3 = 9) <<< this was never planned to be, read below
Windows 10 = version 6.4 (6 + 4 = 10)
Windows 8.1 was never planned to be, it was suppose to go Windows Vista, Windows 7, Windows 8, Windows 9, and on ..., but Windows 8.1 was shoehorned in as a response to the outcry and complaints from desktop users and others about Windows 8. So Microsoft responded with Windows 8.1 but this disturbed the intended numbering scheme path because they used version 6.3 for Windows 8.1 as it was the next version sequence in line and that version sequence number was originally intended to be for what is now (the upcoming) Windows 10 which was suppose to be Windows 9 originally. So we end up 'skipping' from Windows 8.1 to Windows 10 with no Windows 9 in between because in terms of version number sequence Windows 8.1 is Windows 9, so Microsoft could keep to the progression path.
For Microsoft, an operating system with a name instead of a number represents a generation transition or crossover operating system or progression operating system towards a new generation into the next generation. For example, 'Windows XP' (has a name and not a number like 'Windows 5.1') represented the end of that generation to transition into a new generation with Windows Vista. 'Windows Vista' was the cross over between the 'Windows XP' era generation into the new generation windows starting with 'Windows 7'
It could have been worse though, they could have named 'Windows 8.1' as 'Windows 8 ME'

The world and human nature was screwed up before I was born. It's not my fault and I'm just stuck with trying to deal with the mess left behind, so don't blame me.