I am unable to launch the Unity Editor. It is not even reaching the splash screen. I initially was running version 5.5.0 and update to 5.5.2 but problem is still here. I can find Unity on task manager but cant do anything. There is no error or crash report
Try deleting *.ulf files in C:\ProgramData\Unity [Windows] as well as the 5.5 folder
Usually splash screen issues like that are caused by license file problems.
If that doesn’t work then do a clean install rather than a repair.
EDIT: Also (before a clean install) disconnect from the internet then relaunch.
Unity sends data when you launch so it could be something network related…