Zeldalink,
Uninstall WB, reboot your PC, then check your System Registery for the following Keys (if found, delete);
HKEY_CURRENT_USER\Software\Stardock\WindowBlinds
HKEY_LOCAL_MACHINE\SOFTWARE\Stardock\WindowBlinds
HKEY_LOCAL_MACHINE\SOFTWARE\Stardock\ObjectDesktop\WindowBlinds
Launch Impulse and re-install WB from the 'My Desktop' Tab, it shouldn't ask you for a serial or activation.