Hi Naturalone1,
Please share the Operating System installed.
Are you trying to connect to internet using built-in wireless card or are you using a wireless dongle to connect to a 3G network?
Please share if you have made any hardware or software changes to the system.
Alternatively, you can always try restoring the system to an earlier point from system restore option. You may refer to the link http://bit.ly/yNxo6m for steps.
Please reply with the information.