error failed to initialize player

Hi ...

I downloaded unity 3.5 , then opened one of my example . in the unity worked fine but when I made a build to the project ( exe ) then opened it , gave me this message :

error failed to initialize player

could not preload game manager #0

I have : Microsoft.NET Framework 4.0 + Microsoft Visual C++ 2008

I reinstalled the unity 3.4 then opened the same project and build it as I did in unity 3.5, it's worked fine , and I opened the game without any error ....

what should I do ?

thanks in advance ...