NIS2012 installation problem

I successfully installed (from disk) Norton Internet Security 2012 on 2 of my 3 computers, replacing last year's Norton 360.  On one computer it locked into the stage of removing previous Nortons.  I let it run for a couple of hours, then forced a shut-down,

and then tried a reinstall using the purchased disk.  Nothing happens.  Is this a common problem?  What is the solution?