There are false alerts or sometimes even outright bugs from Norton, Kaspersky, BitDefender or other virus solutions, and as soon as we see one we contact the companies to be whitelisted. The Chess King and Houdini 3 Setups from our web site are completely safe, they have been downloaded and installed by thousands of users. You should override the antivirus’ action (for example move the downloaded Houdini 3 Setup out of quarantine). Many antivirus solutions produce false alerts. To avoid these we recommend Microsoft Security Essentials, we think it is the best anti-malware solution available. It’s free, non-intrusive and integrates perfectly with Windows and the Windows Update system.