Problems installing and uninstalling Flashplayer 64bit 11.1.102.55. Please Help?

Hi Adobe Forum.

I am having serious difficulties installing the latest version of flash player (which apparently I HAVE TO install). I 'click here' to download, click 'run' and it starts installing. Then tells me to close Internet Explorer (which I do) and everything that could be using Flashplayer. I then click retry and nothing happens at all. I cancel the download, checked my control panel and looked at my list of programs, it hasn't installed properly. I then go to uninstall programs and Flashplayer 64bit 11.1.102.55 is there. I try and uninstall it and again it tells me to close Internet Explorer. Again I close everything down and AGAIN nothing happens. I have read and done all the possible problems with settings, etc, but nothing changes. I'm not paying Adobe for a product update that they have imposed on me. I just want to watch videos. Can someone please help me. My computer is a Samsung Windows 7 64bit and I am using Internet Explorer 64bit. NB. I have just purchased Norton Internet Security. Could a setting in that be causing the issue?

Thank you!