I think your first call should be to Sony.
I have a 1 week old Sony Vaio running Windows XP Professional. I accessed the wireless network at work, but now all of a sudden can't turn my wireless on. The Bluetooth is still working, and the Intel PROset/Wireless keeps telling me to turn the wireless hardware switch on (already on). I have noticed that when I turn the switch on, instead of one "dingle-dongle", I hear multiples (sometimes two or three). Is this faulry hardware or software?