After removing a fake anti-virus the other day, I had a user that couldn’t open any programs. When the user went to open the programs, they were asked what program they’d like to open the program with. It was quite interesting, but I learned a few things in the process.
First, if you need to launch a command line from within windows (and can’t do run cmd), hold down ctrl while clicking start program in the task manager. This will bring up a dos prompt.
Doug Knox has a great list of files to help you fix file association errors like this one. I found I had to make the user with the problem an administrator on the computer before I could successfully import the registry keys, but after doing so they were back in business in no time.