I got an answer from tech-support, that could solve my problem.
The problem for me was teamviewer. once i closed it in the systray (rightclick>exit teamviewer), the launcher doesnt crash anymore.
other solutions from tech-support (if closing teamviewer might not solve your issue):
Originally Posted by tech support
In the Launcher, go to Options and check 'Disable On-Demand' patching. See if this works.
You can then try to 'Force-Verify' to make sure your files are not corrupt or missing.
You can also try to run in Safe Mode as well.
Here are some other possible solutions if you have not already done so:
Make sure the game and your drivers (graphics, network, sound, motherboard, etc) are fully updated.
You may have to be on a Windows Admin account, or have Run as Admin access to be able to download, install, update, and run the game. If on Windows Vista or 7, you may have to change the level of your UAC settings or turn them off temporarily.
You can try adding the game folder/files to your exceptions list in your antivirus and firewall software. Please see the help menu or support website for the software that you use if you aren't sure how to do it.
At your own risk, you may have to disable your antivirus, firewall, and other security software temporarily while you download, install, update, login to, and play the game. Sometimes the security software will block it or throttle it, no matter what you try or even if you try to add exceptions for the game files in your security software.
Stop any processes that may be interfering with the networking and causing issues with your connection.
Remove/Uninstall any unnecessary programs such as toolbars or Pando Media Booster. You may also need to close programs such as Teamviewer.
You may need to uninstall the game, making sure to remove any excess files, then re-install it.