"IT guys" implies that your computer's from work or school. I've read enough stories on reddit to know that work IT teams monitor use of work computers, you get fired for playing games on them (sometimes even out of hours too, something about misappropriating company equipment).
If it's school... honestly, I'm pretty sure school reimage their computers periodically anyway, so whatever you do doesn't really matter
Be careful about work computers though. Most of my friends dualboot Linux on their school laptops with Windows as default, that way they get admin privileges and they can't really screw anything to do with Windows up.