Jim,I struggled for two weeks with this problem using different versions from 4. to 4.0.5b. Finally installed 4.6 and everything worked fine.

I am having the same problem on a Dell 8300 with SP2 newly installed and vpn client 4.0.5b(also tried4.0.3). I also get a "Remove plugin failed" after the "add plugin failed".I have tried all the suggestions on this website and others. Still get th...