I purchased the cd and it is still installing after an hour. Is this normal?
No.
Minutes at the most even with a very slow broadband.
Where did you purchase the CD from?
Directly from CCleaner. I ended up shutting the computer down and restarting it. Then it showed that everything has been installed.
Unsure but there was a Windows Cumulatuve Update this weekend which may have been installing?(Took half an hour on my laptop yesterday).
As long as it's working alright now then that's good.