Found a solution .. Remvoe Steam Completely from your computer (I recommend using Revo Uninstaller.. once you have Revo open it and then search there for steam.
on steam click right mouse and choose Unisntall. it will run a simple 3 steps.
now you got a window that you have to delete parts from the computer ..
Warning!- Do not check the boxes where the red names are showing . because its a system
files . check only the black named files and then delete it. when you done restart computer and iinstall steam again . all shoukld work !