I’m frustrated

Lost serial number for old Nero 7

Have Nero 7 on my computer and it says license is no good. I had it working on my computer and all I did was reinstall my windows XP Pro and now when I reinstalled Nero 7 it tries to give me a hard time about license. I can't afford to upgrade I just want my old program to work. Looking for a solution. William Hansen pandc54801@yahoo.com you say I don't have an account. It was a long time ago as nero 7 was when I bought your program. I'm 76 so it's old like me
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