Please help HTTP 400- Bad request

Hello,

I am larady having one interent connection which is working properly. In my office we got wireless net working which was showing validating identiy status first time and suddently started showing HTTP 400 bad request bad file while searching in internet explorer. Now i fixed the problem with validating identity satus by unchecking the" Enable IEEE802.1x to the availiable network" in authentication tab of wireless network properties. But still i am facing with HTTP 400- Bad request only with the wire less network even if its got connected. But i can search it smoothly by using my broadband internet connection with out any error...please help me to solve my problem...thanking you