Wireless adapter acting weird

Hello,

i have dell inspiron 1545, OS win XP-sp3. for past one week my wireless adapter is not working at all. its acting kinds weird.

i have updated the driver but still the problem exists.

when i power on laptop my wireless icon on bottom right corner is there with a cross over it. it gives a pop up saying "wireless network detected"

when i click the icon the w/l config windows says "no wireless networks were found in range" although i have w/l networks in my vicinity including the one that i use to connect to.

when i disable my w/l adapter and then enable it from the network connections window it gives this "connection failed" and then my w/l adapter disappears.

in the device manager, under network adapter it shows yellow exclamation on my w/l adapter. i have updated the driver from intel website already but still the problem exists.

please help.