i tried to open up my java script but my commputer says that the monodevelop is not installed properly i tried reinstalling it but it still didnt work can someone help me
I would recommend you download the full Unity3D package and reinstall the editor which automatically reinstalls your Monodevelper too. That ought to fix it all (I think).
Also check that Edit → Preferences → External Script editor points at MonoDeveloper.exe, if you are on Windows platform.