I can't open LoL
halp
halp
Do you happen to be using Avast internet security? If so, it's currently detecting League as a malicious program and blocking it and you'll have to take it out of quarantine.
I actually uninstalled avast yesterday. Still not opening.
Ok, try running it in administrator mode by right clicking the shortcut and selecting it, opening it from the lol.launcher.admin from the top of your LoL folder instead, or running it in compatability mode by right clicking and opening the Properties then Compatibility tab.
You can also try the following;