I was using a shortcut to Firefox which was pinned to the task bar. That was still going to Delta Homes.
Interestingly, Firefox has gone from the Start menu, but running firefox.exe from C:\Program Files (x86)\Mozilla Firefox goes to the correct home page.
So Firefox looks to be free from this.
I tried IE in the infected account, and that still gets Delta Homes.
I really appreciate your help with this!