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TI Home 2010 serial no

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I have just bought TI Home 2010 and when I enter the serial number on the back of the CD sleeve it says the serial no not valid. What is going on?? I have checked the serial number is correct

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Many of us find it helpful to create a text file (*.txt) using notepad then save this serial number to it and save the file in a safe backed up location, perhaps a second drive or CD. In the event that you have to re-install the application you can simply copy and paste it in when requested. Given that 71 characters are required, ridiculous in my opinion, it's easy to make a mistake when so many entries are required.