Mexico virus

Hi everyone
well I went to mexico and was using their free wi-fi in San Felipe the computer was left on, and open to some web sites unattended for three hours, when I came back to it; my wireless connection had been disconnected and would not reconnect; when I go to my device manager network adapter and click on the wireless intel 2000bg network connection the window open and I click on the advance tab its set for ad hoc channel and when I try to change the adjustment it will let me but when I close the window it go back to ad hoc.
my adapter is not communicating with my a wireless card and something is telling it not to.I not sure what it is!!!!!virus malware ect...I do have a anti virus (kaspersky) (marewarebytes anti malware) I ran them both and came up with nothing. I use set f2 and it tell me that my wireless is unconnected; I am thinking I need to reformat my hard because it out of my capability to find. Any suggest would be appreciated : xp pro sp 3 system: any way thanks for listing: this is a great site and everyone is cool....leroyjoe