1) Use another computer 

 2)Find out which of the other 2 are doing it and kick his ass 

 3)Stop posting all together 

 Is it really everyone else's problem that you have to share a computer?  I don't think so.  Do you?  Do you honestly think that Wikipedia shouldhave to put up with this because some people aren't vandals? The fact is that your computer is compromised, so it should be bocked until you can take care of this. Good luck, I don't envy you, but it really has to stop.  Don't you agree?