Personally, I've used XP a lot back in the day, but don't remember much of the details like most users are reporting here, so I really liked to play with your website, and would definitely hire you if I was in such position.
Good luck!
Maybe they could have a fake "patch note" file within the virtual OS which frames it as a hypothetical service path upgrade (which showcases that OP does realize the slight variations in their design, while also showcasing that they can do technical writing)
Maybe styled like a word doc or something