Everything you need to know about Windows 10 -- This page is currently being updated

What happened to Windows 9?
Windows 9 was skipped because it might have caused problems with certain programs and websites. One of the great things about Windows is that programs that are years or decades old can still work on a new computer, with few exceptions. Some older and no longer updated programs would work well on Windows XP but not work at all on Windows 95. These programs would check to see if a user was on Windows 95 or Windows 98. The way these programs checked your Windows version was to search for an operating system whose name begins with "Windows 9", since that would cover both Windows 95 and Windows 98. But such programs would work well on current versions of Windows, but they would stop themselves from installing because "Windows 9" also begins with just Windows 9. So, to avoid any program from blocking itself from working, Microsoft decided to skip the number 9 for Windows. A lot of people were making the joke of saying, in a German accent, "Windows NEIN". That had nothing to do with it.

Should I upgrade?
Maybe. Are you using Windows 7? Then you definately shouldn't upgrade. Although Microsoft is offering a no cost upgrade from Windows 7 or Windows 8 to Windows 10 for one year, you still shouldn't upgrade. Here are 6 reasons why you shouldn't upgrade Windows 7 to Windows 10. Just because something doesn't cost money doesn't mean it is free. Are you using Windows 8? Then yes, upgrade after September 2015. Windows 10 returns to much beloved Start button. That alone is reason enough to upgrade. But you need to wait because despite what Microsoft says, Windows 10 has a lot of problems that will not be fixed by July 29. So wait a few months so that others can have headaches.

What are the disadvantages of 10 over 8?
There is only one: Windows 8 has privacy settings not found in Windows 10. That is to say, Windows 8 respects your privacy much much better than Windows 10 because you can there are privacy settings in Windows 8 that are not made available to users in Windows 10. In addition to that, Windows 10 finds new ways to track you. Other than that, Windows 10 is superior in every other way. If you liked to tablet/phone UI of Windows 8, it is still there. If you miss a Start button, it returns, albeit not in the form you are most familiar with.

What are the disadvantages of 10 over 7?
A lot. First, Windows 10 continues the hard-to-focus flat look introduced in Windows 8. Windows 8 also started the very bad practice of wanting to track you in many ways. Windows 10 continues and extends that tracking. In fact, it has been discovered that some of anti-privacy settings in Windows 10 could not be disabled except with hacks. Windows 7 has none of those tracking problems. The greater privacy in Windows 7 is enough of a reason to make Windows 7 infinitely superior to Windows 10. Just because you cannot escape all tracking from businesses does not mean you should just give up. Windows 7 is also easier to repair because it does not disable the F8 repair key by default. Windows 7 allows you to customize the start menu to fit your style, the Windows 10 start menu is trying to push programs (apps) through Microsoft's store so that Microsoft can get their cut. Essentially, Microsoft is trying to make money off you after the initial sale, and I do not agree with that. In Windows 7, when you search for a program, file, or setting, it searches your computer only. In Windows 8, when this search feature searches your computer and with Bing, so that Microsoft can make money off ads in their search engine. But you can disable this searching with Bing, which everyone should do. In Windows 10, this search feature searches Bing first then your programs, files, or settings, although you can disable it.

To be short: Windows 7 respects your privacy and allows you to customize how the look and feel; Windows 10 does not. Windows 10 is continuing Microsoft's practice of thinking the way they became rich and successful is dead and they think they can force a change on you despite the bevy of complaints. This misguided thinking starts with the lie that tablets will replace PC's.

What are the requirements of Windows 10?
You will need a 1 GHz processor, 2 GB of memory, and 20 GB of hard drive space. But the Techs-on-Call recommended minimum requirements are a dual-core CPU, 4 GB of memory, and 128 GB hard drive. But we strongly recommend you get 8 GB of memory.

My personal impressions will be posted on a blog entry I am dedicating to that.

These are the terms of service for Windows 10. Some highlights (with my comments in parenthesis):

Before you upgrade, please read this blog entry for the proper way to set up Windows 10.