laptop wont open application

please guys i need urgent help, some 7 months ago i contracted a programmer ti help me design an application, he did and it worked well and i have used it for the past seven months, but just today the application automatically shutted down and wont re open on clicking, it does not display any error message but when click it behaves as if it was not clcked.

can some one please advice on what to do please. i can send the application if you like.