Why am I getting Error 2738 when trying to install Unreal Engine 4?

Hello all.

I succesfully performed every step in guide so far, deleted mcafee, did registry re-register, ran microsoft fix, but nothing has helped so far. I don’t know if i still have remains of an old anti-virus program like Fyrex. What could i do to fix this problem, i have exactly problem as it shows on main screenshot at top of this page.