Client will not start

HI guys.i am writing this becasue i have problem with my PBE client,it wont launch after I open him,i get no reaction whatsoever ,problem occured yesterday and i cannot solve it.I am allways runninng client as administrator so that wont help,i checked firewall if it is not blocked and it is not,i do not know what else i should do.I am running game on windows 7 if that would be helpfull.Thanks for answers and pardon my english :)
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