Help with CS5 Activation

I'm installing my CS5-Extended on a new computer (I finally upgraded my PC).   Since my CS5 was an upgrade from CS4, I was ready to enter both the CS5 and the CS4 serial numbers.  But, I was only asked for my CS5 serial number.  It accepted the number and opened Photoshop.   My next step is to update all of the CS5 programs (Bridge, Camera Raw, etc.).   But, every attempt to update the software fails - and the error message states that my serial number is NOT correct.   I deactivated the copy and when I ran the program again, it asks me for the serial number - JUST the CS5 number and once again, it accepts the number, but will NOT update any of my CS5 programs.   Does anyone have a recommendation.