There were recent enhancements to Adobe Flash player installers owing to which you cannot uninstall Adobe Flash from your computer from Windows control panel. In the event that you need to uninstall the Adobe Flash player completely it has to be accomplished by using official tool provided by the Adobe.
Adobe Flash Uninstaller is a small program weighing only 206KB that you need to download and run to remove the Adobe Flash player from your computer. When you run the uninstaller you will be prompted by the uninstaller to confirm the removal of the Adobe Flash player, if you opt for removal the un-installation process would be completed in few minutes.
Instructions from Adobe for Flash player un-installation:
Note: The uninstaller cannot remove files currently in use.
If you have any instances of the player open in your web browsers, instant messaging clients, stand-alone SWFs, or projectors, then theuninstaller will complete but some files may not be deleted. If this occurs, then close all of your applications and run the uninstaller again to ensure that all files are removed.
Note: Internet Explorer users may have to reboot to clear all uninstalled Flash Player ActiveX control files. If you’re not certain, select the “Show Details” button in the Flash Playeruninstaller . If there are any log lines that begin with “Delete on Reboot…” then you’ll need to reboot BEFORE running the Flash Player installer again.