updating client endless restart loop

when an update goes on live servers and i see the update message appear when opening the client i say; nice riot has something new for us. BUT, when i try to install that update the progress bar stops slighty before reaching the end (e.g. 27mb/31.4mb) and i wait for 10-15 mins. Then i close the window and restart the client hoping for better luck this time and what shows up in my screen makes me tilt; an endless loop of restarting messages appear on my screen ...... so, if someone can help me with this please do so that would be great :)