Welcome ot the Adobe Forums,
To better assist you with your issue we need to know:
What is your operating system? (Windows or Mac) (XP, Vista, 7, 8)
What browser do you use? (Internet Explorer, Firefox, Chrome, Opera, Safari)
Are you seeing any error messages?
Can you provide screenshots of the error messages (if applicable)?
windows 7, explorer. no error messages, loads to about 40% then can't load any more
Download the Adobe Flash Player installer directly by right clicking the following link and selecting "Save Target as".
Save it to your Downloads folder - DO NOT run it yet.
Reboot your system.
BEFORE opening anything else, locate the installer and run it.