MCLeaks (and other "free alt" sites) are illegal and remove your ability to login to minecraft.net. Delete MCLeaks fully, then delete the 2 lines from your HOST file that refer 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."
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.