If you receive error 1401 when trying to install TurboCAD, you will need to disable user account control.
In Windows Vista the easiest way to disable user account control is to open the control panel and type user account into the search box.
Click the link for “Turn User Account Control (UAC) on or off”
Uncheck the box “Use User Account Control (UAC) to help protect your computer”
Then after restarting your computer you should then be able to install TurboCAD.
