Client wont start? Look here

I did not create this, this is from reddit and I thought it needed to be posted here.

Step 1 :
Go to "C:\Riot Games\League of Legends\RADS\projects"
Delete "lol_launcher"
Start your client as admin and wait 30s-1mn

Step 2 : (if step 1 not working)
Delete: everything inside "C:\Riot Games\League of Legends\RADS\downloads"
"lol_air_client" and "lol_air_client_config_xxx" inside "C:\Riot Games\League of Legends\RADS\projects"
everything inside "C:\Riot Games\League of Legends\RADS\solutions"
If you don't have those files/folders go directly to step 3.
Restart your computer
Start your client as admin and wait 30s-1mn

Step 3 : (if step 1&2 is not working)
Download Adobe AIR : http://get.adobe.com/fr/air/
Copy/Paste all the content of "C:\Program Files (x86)\Common Files\Adobe AIR\Versions\1.0" to "C:\Riot Games\League of Legends\air\Adobe AIR\Versions\1.0"
If not existing, create those folders.
Start your client as admin and wait 30s-1mn
It should be working, just wait for client to start and update and DON'T CLICK THE BADGE.
Hope it will work for you guys.
See you on the Field Of Justice, Yznathir.
Edit : For people getting stuck at 99% (or 33%), normally just waiting should do.
If not, try changing region (apparently NA is the best option).
If still not finishing, repair your client.
Then wait again, this patch needs to take his time apparently.
Edit 2 : Here's a prepatched version of the patcher from a Red post :
EUW : http://uploaded.net/file/as74il3f
NA : http://uploaded.net/file/q5n6b4uy
This might help you too.
Edit 3 : Apparently changing the compatibility seems to also work for some. (Like putting it to run for XP S3 or even 7 if you are on windows 8)
Edit 4 : You can also try this in the "compatibility" theme :
Go to "C:\Riot Games\League of Legends\RADS\system" -> "rads_user_kernel"
Set it as "Run this program in compatibility mode" and as admin.
Edit 5 : Change your desktop resolution to below 1600px, then start the client. Credits to /u/HelixR
Edit 6 : Something I forgot to add, and it might help if you don't do it, is to run CCleaner and clean your registry.