Vista - Office Home and Student 2007

Running Vista Home Premium on a new HP Pavillion 6000

Want to uninstall Office Home and Student 2007 before installing
Office Enterprise 2007.

Select Control Panel > Programs > Programs and Features > Uninstall a
program

Select "Microsoft Office Home and Student 2007"

Select "Uninstall"

Screen goes black for a few seconds, then comes back with User Account
control asking if I want to continue.

Select "Continue", screen goes black for a few seconds, then comes
back, and nothing more happens. No uninstall wizard, indication of
any activity, and after many minutes, Office Home and Student 2007 is
still on the list of installed programs.