why cant i open the script making?

i downloaded the unity 5 personal the other day and i still cant figure out how to open script. i click assets create c# scripts then the mouse makes the loading screen then nothing

Have you installed MonoDevelop along with Unity? (as far as I remember there is checkbox when you install Unity)

If you haven’t you can use any other external c# IDE for script editing, just press Edit => Preferences => External Tools => select “External script editor”, if none was found by Unity but you’re sure you have one installed you can use browse to find it.

If you have installed MonoDevelop and you don’t have any other external c# IDE then make sure that MonoDevelop is not hanging somewhere in processes, if so kill it and try again, if not then try to reinstall it. Although I wouldn’t recommend using MonoDevelop for c# at all, for example if you’re on Windows then you can get yourself at least a free copy of Visual Studio (Express), you’ll thank yourself later.