Error loading E6F1873B.DLL after downloading music

My son’s laptop had experienced the message error “Error loading E6F1873B.DLL” every time he started it. Before the bothersome error happened, he downloaded numerous music videos from the internet. Everything was doing fine but after several hours had passed the computer rebooted by its own and the error message appeared already.
Additionally, during the booting process, it checked the hard drives and said that the hard drive checking is failed and it went back to the above error message. He restarted his laptop for the last time and the same error had been displaying in the laptop’s screen.
Can you please give me some useful insights on how I can help my son? Thank you in advance.
