Are the other PC's connected by wireless? If they are and they aren't affected it sounds like something is blocking your signal to the router. Have you moved anything around near where your PC is located, DECT phones, microwaves, TV senders can all affect the signal.
You could try changing the channel on the Hub for a start.
I experienced problems with my own WLAN about a week ago. The only thing I have changed is I bought a new DVD player which is located next to the router, I changed the channel and now it's fine.