oops - can't run a program

Deeko

Lifer
Jun 16, 2000
30,213
12
81
So when I tried to run a program, that windows security box popped up asking if I really wanted to run it - I needed to do something else quick so I clicked the X, which I guess Windows took as 'don't allow', and now I can't run it at all.

How can I reverse this?