Try the following link:
Make sure to UNCHECK the box which says - Yes, install McAfee Security Scan Plus - optional (0.9 MB)
Download the installer and save it to your desktop.
Close your browsers and all work.
Click on the Install Flash Player icon on your desktop.
Let the program run -- it doesn't take very long.
Wait for the confirmation - afterwards you will notice that the Install Flash Player icon has disappeared from your desktop - which is perfectly normal.
Hop this helps = and do let us know how you get on.