According to the documentation on the Kixtart site, Windows 7 is not listed as a supported platform.
"KiXtart 2010 is supported on systems with an Intel 80486 or better microprocessor systems running Windows Server 2008, Windows Vista, Windows XP, Windows 2000, Windows NT 3.x/4.x, or any version of Windows 95, Windows 98 or Windows Millennium (referred to in this document as Windows 9x)."
However, I know that many programs written for Vista will work on Win7, but, for some reason, some do not, Kixtart may be one. Have you tried their forum at <a href="http://www.kixtart.org"> Kitstart home</a>?