So, in an act of desperation, you resorted to using MCLeaks. And now it is causing some problems for your computer and you want to get rid of it. Follow these instructions to remove MCLeaks from a Windows computer (Mac OS instructions coming soon).
1. Open MCLeaks and change the authentication server back to Mojang
2. Close both MCLeaks and Minecraft entirely
3. Delete MCLeaks off of your computer. You do not need to use the Control Panel to uninstall it, just delete the MCLeaksAuthenticator file and empty your Recycle Bin
You will need to edit your “hosts” file to remove any references to Mojang, so that you can connect to Mojang’s servers properly.
4. In the Start Menu, search for Notepad and when it appears, right click it and select “Run as administrator” (if you do not have an Administrator account, your will need someone who does have one on your computer to enter their credentials).
5. Select File > Open, then in the Open window, change the dropdown next to the “File name” box to “All Files”
6. Navigate to C:\Windows\System32\drivers\etc
7. You should now see a file that says “hosts”. Click it and select Open
Remove any lines that contain “Mojang”
9. Save and close the “hosts” file
10. Run a virus scan on your computer. Better safe than sorry!
11. Restart your PC
12. If you have a premium (paid) Minecraft account, log in to https://www.minecraft.net and change your password immediately to protect your account. If you don’t have a premium account, buy the game!
13. If you use a similar password for any other accounts, change the passwords on those accounts too! Especially if they use the same email as your Minecraft account.