Hi !
I have the same problem...although I do not know the reason, I have a solution

There is a program called IVAPNETINT.EXE in the IVAP installation folder. It controls the 4 LED icons on the taskbar. I used to run it with a link before starting IVAP, and after it still drop off the error messages, the system and IVAO can boot up fine.

It is not automatical, but works...
Try out this !
I am not sure, but I guess the problem came from a Windows bug: my Windows Username/Folder contains non-English characters which led e.g. MTL installer to go crazy...I can only think that some other programs like IVAP works as is, because of bad installation due to non-English character in the Windows username. Who knows, but I want to reinstall my system in the close future, and I hope the problem will be solved.