If KMSpico fails to activate your Windows, there are several steps you can take. First, ensure that you have the latest version of KMSpico, as updates may resolve compatibility issues. If it still doesn’t work, you might need to consider other methods, such as using a legitimate product key or exploring Microsoft’s official activation support options. In some cases, reinstalling Windows may also help clear any prior activation errors that could be interfering with the process. Always remember to back up your data before making significant changes to your system.