Where can you find an example of a valid product key for Windows XP?

Computers and Internet AnswerA valid Windows XP has the form XXXXX-XXXXX-XXXXX-XXXXX-XXXXX. You can find this type of key on a label attached on a computer running genuine Windows XP.

• The Windows 25-character Product Key is stored on the CD packaging on a bright orange stickerthat says "Do not lose this number." If it was an factory installedlicense, it's stored on a label that the PC manufacturer affixed tothe exterior of the PC case, or on the bottom of a laptop.

After the operating system has been installed, the product key can be changed. (See the link below to change the product key)