Det kan jo være den allerede var installeret, og den er da heller ikke en nødvendighed.
Men ellers installer igen.
Husk at lukke alle vinduer før installering, luk også alt der ligger i nederste højre hjørne, som antivirus mm.:
Important Message: You must close all other browser windows before installing.
Try this first: How to fix almost all Macromedia Flash Player issues
A version of Macromedia Flash Player is pre-installed with most popular Internet browsers. Sometimes, problems with a Flash Player that's already installed can prevent your upgrading to the latest player. You can resolve almost all difficulties by taking the following steps:
Check System Requirements to ensure your configuration is supported.
Make sure you have the latest version of your Internet browser. Installing a new browser can often repair issues with browser installations, and newer browsers may also offer improved security.
VH Palle Hansen