MCLeaks (and other "free alt" sites) are illegal and prevent you from being able to login to minecraft.net. Delete MCLeaks fully, then delete the 2 lines from your HOSTs file that relate to Mojang.
To edit your Host file, please do the following: Go to the Start Menu and locate notepad. Right-click Notepad and select Run as Administrator.
Press File, then Open. Enter %SystemRoot%\System32\drivers\etc\hosts as the "File name" and press "Open."
Restart your PC and then see if Minecraft works. You will also need to change your Minecraft account's password to avoid having your account compromised, as MCLeaks will have stolen your login credentials. In the future, don't use MCLeaks again as it is illegal and breaks Mojang's Terms of Service. If you don't have a real Minecraft account, purchase one from minecraft.net.