Invalid Serial Number for Second Installation of CS5

I want to install my student and Teacher edition of CS5 on a second computer but when I typed in the serial number which I found in the "My Products" section of my online account it said that it was an invalid key.
Is it that I have to prove I'm still a student again and how do you do that? Or is it something else?

I installed on the first PC with a disk I bought which is the same disk that I'm trying to install on the new one.
The operating system is windows 7 same as the old one and they are even both samsungs.
It's CS5 Design Standard that I'm installing so its not specifically Photoshop. The last time I installed it I just installed everything on the disk and didn't have an option to install individuals (if that's what you are asking me).
What has happened is it hasn't even got to the installation part yet it almost immediately asked for a serial number or whether I wanted to install a trail version. Obviously, I've already got a serial number so I typed in the serial number on my account here and it came up with a message that said "This serial number is invalid". I checked it several times. I didn't copy it over incorrectly. That serial number was used over a year ago so  my immediate thoughts was that it had expired.

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