It would be good to know what web browser you are using.
IE8 uses a different uninstaller than IE9. FF and Opera may be different.
Uninstall will only work on IE if IE brower is closed.
Download uninstaller close IE then run uninstaller.
Go here and test Flash player after uninstall and it will automatically prompt you to install the newest version for IE8, FF and Opera. http://www.adobe.com/software/flash/about/
If you are using Google Chrome then go to Google Chrome and update not Adobe.
Do not do a Windows reinstall. Try System Restore first. If you know when it quit working just roll it back before then. If your not sure go back a few days and pick a point to try until you find a good point.
Better than a Win reinstall.
If we get to that point I'll get you someone to help with a Windows 7 repair first .