I remember this period of my own life. I had taken over my father's old 486 and spent my days and evenings trying to learn the basics of programming in C. I was making silly text based games, dreaming I'd one day be creating the game of my dreams. I also modded games by opening every content file and trying to figure out what they did and how I could modify them. I was still years from realizing game development was a career and not just a hobby.
I had replaced all the Windows sounds and cursors to customize the system so it looked and sounded like a Sci Fi system. I even patched the boot screen to be a humorous screen of "MS Broken Windows". It also was quite broken from messing with system files I didn't understand.
It was a magical period and I learned so much.
Because most people don’t know that the boot screen and even the shut-down (Safe to Shut Down Windows) screens were simple BMPs, they get shit scared when you “hacked” the computer to show different messages/pictures. (Always backup and have a renamed copy of the BMP, just in case.)