ITK-SNAP 3.0.0 includes an outdated version of the VC++ 2010 Redistributable with a known security flaw. Please see MS11-025 security bulletin. You can download the patched version here: http://www.microsoft.com/en-us/download/details.aspx?id=26999
Also, please check for a newer version of VC++ redist before calling the installer for an older version. Otherwise unattended installs are difficult.