Did you update using the launcher or using the classic way?
The Launcher. I just double checked it. It seems the launcher doesn't work propperly. it loads some files, then a command prompt comes, saying updater- permission.exe on it and after that it crashes.
I gave the exe admin rights, turned off UAC and my Firewall, but the same thing happens.
Turns out my NI folder was writing protected for some reason. The problem is fixed now.
Can you provide the logs to me? Sent PM to you for email.