Dear Summoner,

Please try those step:

1. Try syncing your Windows Clock, double check the time, date and year.
2. Make sure your Windows is up to date at http://update.microsoft.com/
3. Make sure you http://support.leagueoflegends.com/e...-network-ports
4. Make sure http://support.leagueoflegends.com/e...ewall-settings including this EXE (default install path), C:\Riot Games\League of Legends\RADS\projects\lol_air_client\releases\0.0. 0.68\deploy\LolClient.exe and this website, beta.lol.riotgames.com
5. Check out this article in the KB, http://support.leagueoflegends.com/e...hen-logging-in

Best regards,
GM_Fino