I downloaded CS4, extracted the files. WHen I go to the desktop icon I click open the folder and double click on setup. Nothing at all happens for many minutes. Then I get the Checking System Profile dialogue and it progresses along until about 90% finished and then just sits there and goes no further. No error message - it just sits there forever.

Any Ideas?

Hi Mike,
The problem occurs if the files have not been extracted correctly.
You may download and extract CS4 again and then try running the Setup.

Also make sure to have sufficient space in your Documents and Settings/Mike/Local Settings/Temp directory. If the installer cannot unpack all files, it will halt as well.

Mylenium

might be worth running disk cleanup (or just emptying temp folders) before setup to clear out those temp folders to make sure there's no setup data from other apps getting pulled in by mistake.