Okay, I have not seen a solution yet for DWG Trueview 2014 not installing with the error message "Operating System not supported". I have tried everything that I have seen in the community and still can't get past this issue. I am running on a 64 bit system and have removed everything associated with AutoDesk from my PC. I have the latest versions of everything required (.NET, Windows 7 Professional, IE, etc.) and still can't get this to work. Any help would be greatly appreciated.
It sounds like you might be trying to install the 32 bit DWG trueview on a 64 bit system. Make sure you are slecting to correct option for your OS on the download page.
http://usa.autodesk.com/adsk/servlet/pc/item?siteID=123112&id=9078813
Checked the file and it was 64-bit. Tried your suggestion and downloaded from another site but no luck. I do believe that it is the 64-bit installer that is the problem as we have another PC that is a 32-bit system and I had no problems installing Trueview 2014 on that system. Will keep trying to figure this out, would appreciate any other suggestions.