Interrupting a getting windows ready stuck causes several risks. It can lead to data corruption or loss, especially if critical system files are being updated. This might cause issues with startup, such as boot loops or system errors, and can even render Windows unbootable, requiring advanced recovery steps. Additionally, partially installed updates may create compatibility issues, leaving the system hazardous to security risks or unstable performance. To minimize risks, it's best to wait as long as possible before considering a restart or shutdown.