Quite a strange problem. Out of nowhere, CTRL+backspace has started minimizing windows instead of backspacing the last word in a text box. This is very annoying, since I'm used to using this shortcut to fix mistakes or wiping small chunks of text. Even while writing this, I've minimized the browser window a few times, I use this shortcut that much!
I'm savvy with computers, so feel free to use advanced terminology with me.
EDIT: Problem was caused by "GameCompanion", a tool for making games run in borderless windows. Adds itself to your Windows startup. To solve, open msconfig and untick GameCompanion in the Startup tab.