The Knowhow
Microsoft registers valid licensees via a unique pin-code (known as a 'Product Key') which comes with your software purchase. The product key (see the example below, where 'X' denotes how the Key Code would appear) is usually a 25-digit code, comprised of letters and numbers; it comes with both Windows installation CDs, and Windows downloads.
If you have the CD version of your Windows check the packaging; does it carry a certificate of authenticity? (see the image below for details)
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Check to see whether you Windows software has a holograph on the CD-Rom which came with it. The holograph should be a coating attached to the CD, and not an adhesive sticker or label.
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Check the outer casing on the installation CD-ROM; does it have an outer ring (see below) which should read 'Windows Genuine' when held up to the light (or moved from left to right to reflect the light)?
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Check the inner holographic band on the CD-ROM; this often (but not always) has a series of triangular pointers. This area may also show various hallmarks such as the Windows logo, or a statement that the CD-ROM is genuine.
- The problem may simply be that you have accidentally triggered a problem during installation so try un-installing and re-installing the software or re-inputting the product code.
- If this fails, you will need to contact the retailer you purchased your software from, or contact Microsoft directly to ascertain the validity of your product key.
