The GUI elements look right for the most part, but the font and spacing gives it away --- the way it's rendered just screams "Linux" to me, for some reason.
Here's a previous attempt at something similar, and once again the fonts produce a "something is off" feeling:
Here's a previous attempt at something similar, and once again the fonts produce a "something is off" feeling:
https://kmandla.wordpress.com/projects/lookalike-windows-xp-...