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I cannot open autodesk LT 2012 after update. I get FATAL ERROR: Unhandled e0434f4dh Exception at 770cfc56h when opening a drawing
try re-install the Acad or try re-install Net.frame
.NET Framework issues can be resolved using the .NET Framework Cleanup Tool. More information about this tool can be found at my discussion thread here:
http://forums.autodesk.com/t5/Installation-Licensing/NET-Framework-Cleanup-Tool-for-Unhandled-Except...
Good Luck!