I take your post to mean you are having difficulty downloading Malwarebytes' Anti-Malware, not "malware".If you cannot use the Internet or download any required programs
to the infected machine, try downloading them from another computer (family member, friend, library, etc) with an Internet connection. Save to a flash (usb, pen, thumb, jump) drive or CD, transfer to the infected machine, then install and run the program(s). If you cannot copy files to your usb drive, make sure it is not "Write Protected
". Some flash drives have a switch on the side or on the back as shown here
which could have accidentally been moved to write protect.