How many digits was your PS 7 serial?
 

For those of you who actually bought it..

According to the Registration window when installing PS 7.0, I have to have a 25 digit serial number to install it.

On the cd case where it said the number was.. I have only a 20 digit number.

Did anybody else have this happen to them?

The copy of Photoshop 7 that was bought at my job came with a 24 digit serial number on the case (maybe the 25 was a typo?).
Either way I would say that you should give Adobe a call and explain your problem. I would guess that as long as you have proper proof of purchase and provide them with a copy of the case showing an incomplete serial number that they should be able to provide you with a new legit serial number.

it's 6 groups of 4 numbers

xxxx-xxxx-xxxx-xxxx-xxxx-xxxx