Refer to this:
And check your system. Something is simply preventing the activation from being written to disk or the licensing service connecting to Adobe like a virus scanner or other security tool/ setting.
Thank you very much for your attempt in helping. I have read through the link you gave. Nothing is of assistance there. (it doesnt get to activation). As soon as I press the continue button (second image) (after inputting serial codes (I have CS5 upgrade from 4, so need to put 2 serials in) it just loops straight back to the licesnse agreement (first image). I cannot get no further.
The link Milenium gave you there is also also a button to chat with a agent under "stil having problems
The problem was that something had cached that shouldn't have. The fix was renaming cache.db to cacheold.db (rather than just deleting in case it wasnt the problem) from the below location (Windows 8). C:\Program Files (x86)\Common Files\Adobe\Adobe PCD\cache