Hi.
You are supposed to purchase a genuine copy of Windows, or a genuine license number.
Purchasing a genuine copy of Windows you will need to reinstall the system afterward.
There are also ways to remove the non-genuine message, one way is for example doing a system restore to a date before the message was displayed. This won't make the copy of Windows genuine. It will simply get rid of the message but you will still not be able to perform updates and to get the advantages of genuine Windows OS.
If there is a license sticker on top of the computer, you can make the copy genuine by reinstalling Windows with the number in the COA sticker.
You can purchase system at nearest computer shop. See for example
Windows Vista ..
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