This will prevent the launcher from crashing after logging onto your NCSoft account, works and if you have the same problem you'll be as happy as I am right now to have found this fix.
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Let's try again to resolve this issue please do the following:
Click the "Start" button to bring up the Start Menu.
Type in CMD into the "Search programs and files" field but do not hit enter. Doing this will change your start menu to show the program "cmd.exe."
Right-click on "cmd.exe" and select "Run as Administrator."
Type "netsh winsock show catalog >C:\LSP.txt" without the quotes. This will save a file to the root of your C drive called LSP.txt. Please attach that file to this ticket. (We would like this report even if the issue is resolved)
Once complete, type "netsh winsock reset" without the quotes. When the command is completed successfully, a confirmation appears, followed by a new command prompt line.
Once completed, please try connecting again.
Credits to the NCSoft staff team and Jeluk @ LineageII.com