Remove MCLeaks or any AltDispencers, run a full virus scan, run a maleware scan, change your Minecraft password and any other passwords that maybe the same as your Minecraft one as MCLeaks will have stolen it, shame on you for using illegal software to access stolen accounts and clean your HOSTS file by removing any lines related to Mojang.
To edit your Host file, do the following:
Go to the Start Menu and locate Notepad. Right click Notepad and select "Run as Administrator"
Click on File, then Open. Enter %SystemRoot%\System32\drivers\etc\hosts as the "File name" and click "Open".
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Say something silly, Laugh 'til it hurts, Take a risk, Sing out loud, Rock the boat, Shake things up, Flirt with disaster, Buy something frivolous, Color outside the lines, Cause a scene, Order dessert, Make waves, Get carried away, Have a great day!
I appreciate you telling me the problem, though the shame part was unnecessary. I currently share this computer and I don't believe it was myself that was trying to download a stolen Minecraft account, because.... I own one. Either way I'm assuming it was my sibling so Ill remove whatever they did.