No need to search for the tool to unload flash.

double click to the following location and you will find a flash removal/uninstall exe here. C:\WINDOWS\system32\Macromed\Flash

Then browse to a flash website, I use http://www.archant.co.uk as that's who I work for, and install flash from there.

If this isnt the error, have you installed a popup blocker? If so, disable it and try again.