Can you clear the error message? If so open up WindowBlinds configuration and post the system info.
How did you download WindowBlinds, Stardock Central or Impulse?
If you can clear the error message you might want to try an uninstall, run a clean up program like CCleaner and Registry clean up, reboot and then reinstall and reboot. From what you say I take it that WB didn't even work? Correct me if I wrong.
I would use Impulse but SDC should still work.
EDIT: Just rereading your post, Did the error stop the computer from booting up?