Error message in WindowsBlinds 7

Hi,
When I try to use WindowsBlinds 7, an error message appeared on my screen mentioning "WindowsBlinds does not appear to be installed correctly on this machine. Would you like to fix this issue now?" I am confused what could be the reason behind it as I have the full version and no other complication. The message mainly shows up when I apply a skin. What is the problem with the WindowsBlinds in my PC? Please help me to find a solution.
Thank you in advance.
