How do I delete mightymaxpc.com from my computer? It is giving me extensive errors on my computer?

Use a 3rd celebration adware/spyware/malware removal program.

Use google and download “Malwarebytes' Anti Malware” and “Spybot Search and Destroy”.

Close all windows (internet etc) and install those 2 programs, when prompted rather or not to update them (it'll ask you during the installation) answer yes and let it update the software. Using Malwarebyte's perform a swift scan then follow the on screen pop ups to remove what it finds.

Run Spybot S&D 2nd, remove what it finds and then use the “Immunize” button on the side bar and click the 2 “Immunize” button within the window that pops up. This should remove all the unwanted crap off your computer and help keep it off at the same time.