Microsoft Support

Microsoft Home Page

Sign in

Select the product you need help with

Select a solution

How to determine whether a computer is running a 32-bit version or 64-bit version of the Windows operating system
Describes how to determine whether the computer is running a 32-bit version or 64-bit version of the Windows operating system.
Genuine Windows - Microsoft Windows
Learn about genuine Windows—help and how-to, how to get it, business solutions, and more.
Resolve unexpected Function (F1 - F12) or other special key behavior on a Microsoft keyboard
Explains why certain keyboard keys, such as NUM LOCK, INSERT, PRINT SCREEN, SCROLL LOCK, BREAK, and function keys do not work when you press them on a Microsoft keyboard.
Windows 7 displays "Windows is not Genuine" with an error code of 0x80070005
Free downloads - Microsoft Windows
Get free downloads for Windows 8, Windows 7, Windows Vista, and Windows XP. Get themes and other free downloads to customize, protect and optimize your Windows PC.