Unable to install Flash Player as "only a single version of this application can run"

I was having problems with Flash Player earlier today and decided to uninstall it (from Windows 7) and reinstall from scratch.  I uninstalled it and tried reinstalling it but now I get the following message: Unable to install Flash Player as "only a single version of this application can run" I tried uninstalling   I checked to see if there was still a programme to install but there is not. I checked my files in Windows and there are several files called Install_Flashplayer _16x32 .............. files. I presume they were created each time I attempted to install Flash Player.  I thought of deleting the numerous Install FlashPlayer files but decided to seek help before taking this step.
Browser: Firefox 35.0.1
Windows 7 Home Premium
64bit OS

I have somehow managed to install Flash Player and it works. I deleted all the install files except one which did not want to be deleted, Then I started to install Flash Player until I got the message about conflicting applications. I then used Ctrl+Alt+Delete to open Task Manager, then closed all tasks except the Flash Player one. Flash Player finished installing. I then opened a TV Player in Firefox and was able to play a programme that required a Flash Player.
Why do I have to use Task Manager to close applications. I can't remember the last time I used it ut think it was about a year ago when my computer would not shut down.

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