Please Help" i cannot sign in using my net passport to chat rooms & cannot send messges on Hi5?

I mean this use to work before, i use to use ma net passport to some chat rooms but it wont sign in and NO errors message will coem up either, and i also cant send message on Hi5, i can do this from other PC's in net cafes, but not my own, i cleared virused, everything, but still cant what seems to be the problem, anyne plz

Please Help" i cannot sign in using my net passport to chat rooms %26amp; cannot send messges on Hi5?
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