error comes up when i try to open Gimp

I installed brushes today and rebooted Gimp and have since then got error message and it says it is sorry it has to close without opening. I have gimp 2.6 exe. the message says it has en counted a problem and needs to close. I rebooted the computer and still am having problems. I have installed brushes into the brush folder before without this problem. thank u in advance for help here..
Sueauzzie