Summary
The following is what we know about occasional errors that happen during the installation of MediaLab and/or DirectRT.

Details

Error 1926
Your system Administrator may need to give you greater privileges on this computer. Are you logged on as an Admin while doing the installation? If so, right click "c:" under "My Computer" and select "Properties" and then "Security"--can you verify that both "Administrators" and "System" have full control of the drive? Full control is necessary during the installation process