If you were happy with your KDE installation, then use KDE. The issue you encountered sounds like there was probably a bug in an update you took for your graphics card, or something like that. It sounds kind of like this thread, with a similar graphics card as well: Got nailed by an Update, Need Nvidia Driver
It might have been helpful to create the forum post when you first couldn’t get your installation to boot, to see if anyone could help you get your installation fixed. What you did instead seems somewhat dramatic:
If that is the OS you were happy with, try installing again. Start with open source drivers if you have to, and get the LTS kernel installed to see if it helps with the network issue you are having. Open a new thread if you need help getting your network card working, or the proprietary graphics drivers installed.
It’s a little late now, but you can cause irreparable electrostatic damage to your computer by cleaning out the fans and dust vents with a normal vacuum cleaner. You are lucky you didn’t brick your CPU. It is better to use a can of compressed air.