Developing Fast': Britain Facing...
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No best answer has yet been selected by lozzzz. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.could be this - does this sound like your experience?
http://securityresponse.symantec.com/avcenter/venc/data/w32.velkbot.a.html
Try totally uninstalling Yahoo messenger etc,
Run a spyware check on your computer
Then download the Yahoo messenger again, and try and log in.
Why cant you contact Yahoo btw???
http://help.yahoo.com/l/us/yahoo/messenger/messenger75/messenger/messenger-12.html
has the option to contact Yahoo customer care (obviously another free email account you will need, hotmail etc)