If your PC keeps dropping and having to "reinstall" the drivers for hardware hooked up via USB. I'd replace the motherboard. Especially if you know those devices when hooked up to other PC's work just fine.
The motherboard , and relevant controllers control USB connectivity. If that video card works in a different PC which I'm sure it will with your described symptoms I'd start there. RMA that board if you are on a fresh installation of windows.
But if all you did was "upgrade" a few components and it started happening I'd recheck All the wiring and make sure nothing is loose. Because other then that about the only thing I could place blame on assuming all things equal would be the board at this point in time.
About the computer freezing and giving you a driver error, it happens with most gpu's (including my 270X) running the newer beta drivers...try switching to the stable 14.12 driver...AMD has to get their $hit together and release a new stable driver cause the beta drivers are TERRIBLE. Im stuck on 15.5 Because otherwise GTA 5 and Witcher 3 are unplayable.