I can not see the error:
UPDATE clientes SET
txtEndereco=\"Rua Xingú, 823\",
txtBairro=\"Val ParaÃso\",
txtCEP=\"09060-050\",
txtUF=\"35\",
txtCidade=\"14933\",
regiaos=\"\",
Obs=\"Princesa fada\")
WHERE idCliente = \"2\
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server for the right syntax to use near '\ "Street Xingú, 823 \", txtBairro = \ "Val ParaÃso \", txtCEP = \ "09060-050 \", txtUF = \ " 3 'at line 1