 Yahoo messenger not signing in
Since more then a week now , i can not sign into yahoo messenger
I m having window xp and internet explorer 6.0.2900
I m not under a security wall since all other using the same server can sign in from their own computers
I have tried all connection prefrences (no proxies /no net work detections and fire wall with no proxies)but still i can sign in
But when i try signing in with proxy i get this message immidetly --
U have been signed out since u r already signed in with other computer or device
well my Id is not hacked as all others who have tried with my PC have the same message
I tried downloading yahoo messenger again - now its 7.5 but still cant sign in
What do u suggest??
Thanx in advance INVALID ARGUMENT*** | 
