y the new patch 6.21 is not installing... i got stuck....

i m facing a big problem now.. the new patch is not installing at all.. not only me but all my friends in EUNE.. can anyone tell me what should i do.. i even downloaded the Hextech Repair Tool.. but nothing happened.. suggestion pls... the r saying ' unspecific error occured. pls check my log for more info.... but what i should i check for???? pls help me.. [zombie-brand-mindblown]