I'm trying to install Revit Architecture and when it tries to install dwf viewer I get this message "A copy of autodesk dwf viewer 6.5 or earlier is installed on this computer. You must unistall this version of dwf viewer before installing autodesk design review 2011." I think i deleted everything out of that program and now i have no idea what to do. Search for "dwf" is returning no results
Windows Installer Clean Up Utility from Microsoft was the application used to detect remnants of uninstalled programs.
However, it has been retired due to problems caused to MS Office Applications.
I suggest you contact Microsoft on how to go about uninstalling progams which still have remnants on your machine.
You can also try Installing from diagnostic mode:
Product Support Specialist