Not sure of PS7 but with the newer versions there is a set number of active copies you can have. You can only have 2 activated copies. If this is the case go into your old computer and deactive PS7 then activate it on new computer.
It is Photoshop 7.0 no cs in the number it is at least 10 yrs old maybe older
and the computer it was on crashed and is no more so now what?
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I use Photoshop 7 and it doesn't have an activate, only a register.
Don't think activation started until the CS series came out.
Photoshop 7 did not have any activation.
Now, the error you give is about registration - which is optional, and you only have to do once.
If that is not the correct wording for the error, please let us know the exact wording of the error you see.
Also Photoshop 7 is so old that it probably won't run on modern OSes, partly because it comes from the days before Terabyte drives (and thus hits limitations in the OS when reporting disk sizes).