You need to make sure you do have a license to use the software.
But I have had considerable issues with licensing CS3 products. I never bought or upgraded to CS4, so I do not know if Adobe is using the same licensing scheme for CS4 applications, but it looks like they did. It is awful. Here is an article that may help you fix the issue.
I have had to do this on CS3 products at least four times. I understand that Adobe changed the licensing scheme with CS5 and 5.5. That was a very good idea.
Well thankyou for your help but that isn't 100% my problem. I dont get the window pop up like how the forum you showed me has. When I try to open DW or FW, nothing happends. (As if I never clicked on them.)
That error message stopped poping up soon after I posted my problem.
I still got the enter your serial number pop up but once I had entered my information it would just quit without an error message like the one in my forum post.
It may not be relivant to you if your not from NZ but maybe you need an expert to share your screen from Adbobe customer care?
I'm sorry that I can't be of more help.