So i had to restore my computer to its previous saved backup because i got the a bluescreen for some odd reason. Now it said that the launcher wasn't working, so i tried to re download the client. Now that i re downloaded it, i have no launcher at all? What should i do to try to resolve this? any help would be appreciated. Thanks

This.

Fellow Summoners!

Here is the solution to fixing this bug:

1) Go to your Riot Games installation on your harddisk, usually C:/Riot Games/League of Legends

2) Open the following directory:

rads // projects // lol_air_client // releases // [the highest number]

Delete the following files:
- releasemanifest
- S_OK

Open the 'deploy folder'

3) Within this deploy folder, delete the following folders/files:
- lib (folder)
- META-INF (folder)
- mod (folder)
- lolclient.exe (file)
- lolclient.swf (file)
- locale.properties (file)

4) Restart your LoL application

*Thanks Afmuente for improving

By Boompje.