Something else you can do, if you still can't get task manager up. Is set up some voice commands that will kill the process of whatever app you tend to have a problem with.
So, let's say Halo 4 is your main problem, then you can make a voice command to kill its process directly.
I don't know the process name for Halo 4, so this is just example.
Close 'halo 4' process
Use this command, to get the process name from and program you have your moue cursor on, and it will copy the process name to the clipboard, and then you can just paste it into a command. This will also print the name in the VA log for you to see directly.
Write [Blue] '{WINDOWPROCESSUNDERMOUSE}' to log
Set Windows clipboard to '{WINDOWPROCESSUNDERMOUSE}'
There are many, many way to kill a process. You can use AutoHotKey script as well, and have VA run it.
I hope this helps.