Minecraft Launcher FATAL ERROR

When you open the new launcher (.exe) this error log will show up:

Bootstrap started
Looking for update
Downloading: https://s3.amazonaws.com/Minecraft.Download/launcher/launcher.pack.lzma
Got reply in: 709ms
No update found.
Reversing LZMA on C:\Users\...\AppData\Roaming\.minecraft\launcher.pack.lzma to C:\Users\...\AppData\Roaming\.minecraft\launcher.pack
FATAL ERROR: net.minecraft.bootstrap.FatalBootstrapError: Unable to un-lzma: java.io.FileNotFoundException: C:\Users\...\AppData\Roaming\.minecraft\launcher.pack (Zugriff verweigert)
at net.minecraft.bootstrap.Bootstrap.unpack(Bootstrap.java:134)
at net.minecraft.bootstrap.Bootstrap.execute(Bootstrap.java:111)
at net.minecraft.bootstrap.Bootstrap.main(Bootstrap.java:367)

Please fix the error and restart.