Can't you open or find your tax return? Or won't the program start? Is it asking you to activate it again? What have you tried?
Make sure your computer is the same way when you originally installed it. Like with no flash drives plugged in or plugged in if one was. It asked me again so I just closed the program and took out a flash drive that was plugged in and tried again. It worked. Or you may need to connect a flash drive or printer or something that was connected when you originally installed the program.