I just installed LV2011 and one dll from my vi won't load with the error "application configuration is incorrect", which is Windows lingo for "missing package dependencies". All the computers at my company with 2010 loaded seem to do OK. When I do a Dependencies Walk I get missing Visual C debug dll's missing plus IEshims and wer which both have a whole tree of dependencies missing on my machine. The Windows install is the same "Windows XP version 2002 Service Pack 3" So I'm thinking I have to uninstall 2011 and go back to 2010. Is this correct? Those VC debug dll's were installed on the machines with 2010 in them but were not installed in mine.