Situation:
You installed a Symantec product and you completed the product activation successfully. However, whenever you restart the computer, you are prompted to activate the program again. If you enter the activation code each time, then after a number of restarts you see the message "The trial period has expired. This product has been disabled because you have not activated it."

Solution:
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Technical Information:
Product Activation is an anti-piracy technology designed to verify that Symantec software products have been legitimately licensed. For a description of the Symantec product activation feature, read the document FAQ: Symantec program activation.