Got a vacant USB port or two on your PC? You'd like to use it for something useful, but don't know exactly what? Check out five practical things you can connect to your free USB ports, some of which can reinvent the way you control your PC.

I’ve spent more hours than I care to admit diagnosing stubborn Windows problems: sluggish laptops, desktop crashes, weird startup behavior, you name it. Over the years, I’ve used plenty of different tools, from flashy “PC optimizers” that promise too much, to hidden system utilities that actually deliver. What I’ve learned is that many of the best ones are lightweight, reliable, and give you a clear view of what’s really happening under the hood, so to speak.