Autodesk DWF Viewer has encountered a problem

Hi guys,
Autodesk DWF Viewer has encountered a problem. Have a look at the error message below.
I do not understand the installer did not find the uninstaller. I want to get a remedy of this issue.
Please help.
Thanks in advance.

Autodesk DWF Viewer 7 IE7HotfixBeta
The installer did not find an installation of Autodesk DWF Viewer.
