"Your Adobe Photoshop user name, organization or serial number is missing or invalid"

My computer had a new HD and thus I had to reinstall my CS, but activation failed since it has been taken down.
So I was directed to a page where I downloaded and installed another CS including the serial #.

After installation, when I try to start it, I get the above message and then Photoshop quits.

I was directed to this place after login with my Adobe Id:
Download Acrobat 7 and CS2 products

where I downloaded the english CS2 for Windows version.

The funny thing is that the PS splash screen has all the information and it didn't complain when I installed and entered the serial number!?

I'm on Win7 if that's important.

Br Mikael