Ok for those of you who can get the launcher running and get stuck at launching here's what worked for me. Close the launcher and hit:
end agent.exe and any other bnet related processes
go to the program files folder and delete EVERYTHING there
relaunch the launcher in compatibility mode with administrator privileges in XP SP3 mode
once the update is done hit launch nothing will happen, curse whatever god you worship but then open task manager and close agent.exe again.
you should see the process restart and diablo should launch.
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