Plutonium

Did you have steam running in the background? Could be the reason it happened. Pirated copies and plutonium only work if Steam is off.

420x Hmm, try reinstall plutonium then run it once. After that, add it to your AV exceptions and then reboot the computer. On reboot, run it as admin.

Rebooting the PC does help after adding the exception.

I am assuming you did not reboot after both the reinstall and adding it to your AV exceptions as I finish writing this.

420x Add plutonium to your app exceptions in your Antivirus then run the launcher as admin just once. Should work fine after that!

Just set an exception for Plutonium in your Anti-Virus. Then reboot computer and run plutonium as admin just once.

zF3rret Just set file exception in your AV. That way, your AV is set all the time!

Try set an exception on your antivirus then restart computer. Once rebooted, run it as admin just once.