Yes, this Parental Filter application is safe and there should be no conflict with an antivirus program. Unfortunately, you can't download it anymore because there isn't an online resource available for this purpose. From what it seems, the software has been discontinued and it is no longer supported. I suggest you check Software Informer database for an alternative. Once you download and install a program, add it in your antivirus "Trusted/Allowed" list. In this way there will be no conflict and your computer will not crash anymore.