An antonym for "computer malfunction" would be "computer functioning properly." When a computer is functioning properly, it means that all the hardware and software components of the computer are working as intended, and there are no errors or glitches in its operating system. A well-functioning computer operates smoothly without any unexpected shutdowns or crashes, and it is able to perform all tasks efficiently. In contrast, a computer malfunction is an indication that something is wrong with the computer, and it needs to be identified and fixed to restore its proper functioning. It can cause inconvenience, lost work, or even data loss. Therefore, it is critical to ensure that computers are functioning properly to prevent any disruptions.