I already explained this a little in another question about restarting your
career. You can use the same answer here if you want, but I will give one more
example of not changing your major in the long answer section.
This answer demonstrates a good choice in the beginning. I included the portion
about computers because they want to see something you would have done
differently. And making the comment about computers shows the interviewer your
understanding about technology to some degree. But don't say this answer
without first stating that you are pretty good with the computer.