There are other users who have had similar problems. A good search of the site will uncover possible resolutions.
Here's a good start:
of course, if you read the rest of this thread, you'll see that the link above doesn't work. that's because I'm a moron. however, I'm sure you get the idea...
also, when posting for assistance it is usually best to let people know the hardware and drivers, etc.....(hint: search for your wifi card model, specific errors you come across, etc.)