PHOTOSHOP CS3 PROBLEMS

Hello,
I AM HAVING PROBLEMS WITH MY PHOTOSHOP CS3 ITIS A PROGRAM THAT CAME WITH MY PREIUNM SUITE FOR SCHOOL IT WAS WORKING JUST FINE AND THEN I HAD TO BACKUP MY COMPUTER AS IT CRASHED ON ME AND NOW WHEN I PUT THE PROGRAM BACK IN THE PHOTOSHOP CS3 WON'T WORK WHEN I STATR IT IT STOPS ON NIK 2.0 AND SOMETHING ABOUT PLUG INS AND I DOWN LOADED THAT AND IT STILL WON'T WORK ADOBE WON'T HELP AS I DON'T HAVE THE CS4 ALL THE OTHER PROGRAMS THAT CAME WITH THIS ALL WORK FINE BUT THIS ONE COULD SOMEONE HELP ME PLEASE??????????????????????????????/