Elements 6 will not register after install, which is keeping an upgrade version of CS3 from working because it needs to see a qualifying product before it will work.
Also under CS3, the list of Qualifying Products only includes Elements 3, 4 or 5 with no option for 6.
This is on a customer's new computer, after his old system died.
Elements 6 would not be a qualifying version for CS3 because they were released at the same time (I am surprised any Elements qualifies if you are talking about a whole Suite - apples to oranges).
After 1.5 hours on chat with Adobe, I was able to get CS3 registered using control+shift+double-click to reach a challenge code. The Adobe Rep was able to authenticate the challenge code as legitimate and gave me a pass code that I was able to use to correctly register CS3. Everything is up & working good for my customer now.