You could try following: While opening Premiere and when it hangs on QT32 server, try to kill process in task manager and kill premiere process, then check if the QT process is down and also check if Dynamic link process is down. If they are just restart Premiere.
If the QT process can not be stopped then you have the problem with your firewall software. There are some third party firewall apps which can cause QT server to fail to instantiate, for instance Comodo firewall for sure I had bad experience with it.
Also there is one more possibility that you added some new codecs which conflict with the old ones especially concerning quick time like for instance DNXHD QT codecs or similar from Avid.
These info can not be found on Adobe or at least I have not found it there.
Hope this will work for you or at least give you idea how to find the solution.
Best wishes