Hi again on this subject!
This, as was said, two years old problem still here.
Migration in process from ZFD 4.0.1 to ZCM 10.2 and ... same happen! "Failed to launch C:\WINDOWS\explorer.exe. Exit code: 1". Even I do follow TID 3253435 ... same! I missed something? Maybe, but, indeed, problem should be solved by now! =)
More thanks, Alar.