The client won't open !

First i couldn't log in to the game . so I deleted lol and tried to reinstall ; after i open the shortcut on my desktop to patch, the "League of Legends" text logo pops up in the middle of the screen for a minute and that's it. Nothing happens after that .

i did :

• Clear the Registry
• Run as administrator
• Disable the firewall / antivirus
• Instal all windows updates

the game was working fine 2 days ago . Any help would be appreciated!