Thank you for your feedback. DWF Viewer 7.0 is a very old version which was released before Windows 7 released.
I would suggest you download and try the latest version of Autodesk Design Review 2011, this verison is supported on Windows 7.
For your convenience, please get the download from: http://www.autodesk.com/designreview
Any further question please let me know.
Log in to access your profile, ask and answer questions, share ideas and more. Haven't signed up yet? Register
Start with some of our most frequented solutions to get help installing your software.