All ON1 Software installers and installed files are scanned with Microsoft Security Essentials. We also submit our products to Kaspersky, Symantec, Norton, AVG, etc. to be whitelisted. Still, your antivirus software may detect certain files as harmful. This is a false positive error and can be avoided by turning off the antivirus software during installation of our products.
We feel strongly that if Microsoft feels the installers and subsequent installed files pose no threat then your system will be safe installing our products. Like many other software manufacturers, we do recommend temporarily disabling third-party anti-virus products to avoid a false positive while installing the software.