Hello, I'm new in the forum ... I bought a few months ago emergency 4 ... All right, it opens correctly .. ok .. Then after a month of play will not open anymore. As soon as you open it you will return to your desktop. My pc is not powerful but when I installed the game went !! The requirements of my pc are: Windows Vista Home Basic , 1 GB RAM , 32 Bit , Intel Pentium D CPU 3.00 GHz 2.99 Ghz. I installed it on another computer of a friend of mine but does the same thing !! Help me please !! I'm Italian