Maximum installed copiesĪs a form of protection many programs, especially games, only allow a few copies of the program to be installed.
If you tried all combination of letters and numbers, enter the key code as someone else reads it out loud.
Other problem letters include a capital letter "i" that looks like a lowercase "l," or a lowercase letter "l" that looks like the number "1." Make sure you're entering an "O" and not a zero if that is what needs to be entered. Characters, such as the capital letter "O" and the number "0," can be difficult to read. Make sure all the letters and numbers you are entering are correct.
A Microsoft Windows OEM product key will not work with retail versions of Windows. A Windows upgrade product key is not going to work for a full version of Windows. Each version of Windows has its own unique product key, meaning a Windows XP Home product key is not going to work for Windows XP Professional. You would need to use the Windows Vista code that came with the software package.īelow are some additional reasons a Microsoft Windows product key may not work. However, keep in mind that if your computer shipped with Windows XP and you're trying to install Windows Vista, the code on your computer only works for Windows XP. Use this code to install Windows on your computer. With many OEMs, (e.g., Dell, Hewlett Packard, etc.) the manufacturer will place the code used with your computer on the back or bottom of it. If you are installing Windows and the code you are entering is not working, make sure it is the correct code. However, there are different reasons that cause the number not to work, as mentioned below. The unique identification number or CD key that comes included with the software or your computer should always work. If you have lost your license information, see: How do I get my unique identification number if I lost it? This page is for users having trouble entering their CD key, product key, or unique identification and not for users who have lost their unique identification number.
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