I can't install the Flash 12 update (from 11.9.900.170) on either my desktop or laptop, both of which use Win7 and IE11. The updater downloads the exe, but then seems to hang up, with nothing else showing up on the display. When I check Task Manager, I can see the exe 'running', but nothing happens. The Adobe AIR update ran without problems.
Download the following by right clicking and selecting "Save target as":
Save these to your Downloads folder - DO NOT RUN ANYTHING YET
Reboot your system
BEFORE running anything else, run the Uninstallers.
Go to: C/Windows/System32 and delete the Macromed folder.
Go to: C/Windows/SysWOW64 and deletew the Macromed folder.
Open your Registry Editor (Start>Run or press the Windows key + R, and then type "regedit" [minus the quotes] and click OK)
In the Registry Editor, go to HKEY_LOCAL_MACHINE/SOFTWARE and delete the Macromedia folder
Go to HKEY_CURRENT_USER/Software and delete the Macromedia folder there as well.
Close the Registry Editor and empty your Recycle Bin.
Once it finishes, run the Flash Player installer for ActiveX.
Afterward, download the Shockwave Player 12 FULL Installer to update it too. (Note: the link is to a download page - there ISN'T an ActiveX full installer download I can post here. Also, it says 11, but it's 12)