Hi, Some antivirus programs recognize Princess Maker 5 program as a virus, preventing its normal installation and program to start up. We have now solved the problems with major antivirus tools as below. - V3 - Alyac - BITDEFENDER - F-secure - Microsoft security essentials - Malwarebytes - Avast free Antivirus Please let us know the information on your antivirus tool if you still have similar problems, and we will take action accordingly. Thank you.