League Client no longer opens?

Hi. I use a Dell all-in-one and just now I tried opening my client 3 times but it didn't work. My computer uses Windows 10 and I open the client by going to the windows button on the bottom left hand corner and scrolling down across all my apps and clicking the League folder and the client inside. When I clicked on the client, it showed the league icon but the icon soon disappeared and the client didn't open. Normally, the icon shows for a bit then opens to the login page. What do I do? btw I'm not administrator either.