If you're like me and you love this game a lot, here's the fix:
1. Go to your Control Panel
2. Under Programs , Click Uninstall a Program
3. Uninstall Pando Media Booster
1. Click your windows button / start button and where it says Start Search type services. There will be a program with a little clock work type cog, as an icon, Click on it.
2. Scroll Down to IP-Helper and on the left click stop service.
I tried it and it helped a lot. If you can play your games already because of this fix, please comment below and let other people now!
Enjoy your LoL games!
(This is from this link: http://euw.leagueoflegends.com/board...d.php?t=429243)