WL7 rendered songs are very distorted

Hello all
As in the title bellow says, when i render songs i allways got overdriven ( distirted songs ) it doesnt matter how i configure WL for example i turned all the plugins off got the same resolt by rendring allways distorted !!!
Do i do something wrong ? any help from you ?

Start from the simplest case. Have no plugin, no master section again. Then add each plugin one by one until you find the problem.