Device manager is usually step 2 or 3 when something is going wrong. When you're fixing someone else's computer, you'll probably spend a lot of time there. Wind

Device manager is usually step 2 or 3 when something is going wrong. When you're fixing someone else's computer, you'll probably spend a lot of time there. Windows also tends to break in mysterious ways after applying OS updates which need to reboot. The observable symptoms are things like network timeouts, performance drops, and random application crashes, but the people you're providing tech support to usually don't have the knowledge to recognize when those are justified problems or windows itself being silly.