You don't say what operating system you are using, or whether you have successfully run the same version of ArchiCAD previously.
The file you are missing is usually located in the standard ArchiCAD folder - on a Windows machine it's C:\Program Files\Graphisoft\ArchiCAD 13
Can you check whether the file actually exists or not?
There should be quite a number of other files and folders in the same place. If it isn't there, something must have gone wrong and you should try reinstalling/repairing ArchiCAD from the disk. You may also need to re-install the latest hotfix afterwards.