You need to check if your computer requires the minimum system requirements for Football Manager 2013:
For Windows:
OS - Windows XP, Windows Vista, Windows 7 or Windows 8;
Processor - XP: 1.6GHz, Vista/W7/W8: 2.2GHz;
Supported Processors: Intel Pentium 4, Intel Core, AMD Athlon;
Memory - 1.0GB RAM;
Hard Drive Space - 2GB;
Video Card - 128MB;
DirectX - 9.0c.
For Mac:
OS - OS X 10.6.8/10.7.x/10.8.x or higher;
Processor - Intel Processor;
Memory: 1.0GB RAM;
Hard Drive Space - 2GB;
Graphics: Nvidia Geforce 7300 GT or ATI Radeon X1600.
If this requirements are fulfilled, try reinstalling the game with the steps provided by Sports Interactive.