Uninstall Flash Player | Windows:
http://helpx.adobe.com/en/flash-player/kb/uninstall-flash-player-windows.html
http://download.macromedia.com/get/flashplayer/current/support/uninstall_flash_player.exe ⇐ direct link

Flash Player - Downloads for Full Installers:
http://www.adobe.com/products/flashplayer/distribution3.html

Note: If using the Adobe Download Center, please be aware of any pre-checked optional downloads. Flash Player will run properly without them.

Version Checker:
http://www.adobe.com/software/flash/about/