This is a problem with the Windows Installer and does not originate with Legacy. There is still a program Installer configuration file (usually belonging to SmartSound QuickTracks, Turbo Tax or AutoCAD) on your computer that is starting when Legacy tries to open a common file used by both Legacy and the other program.
There is a Fix It tool available from Microsoft to clean up Windows Installer remnants that can cause this problem. Please visit https://support.microsoft.com/en-us/topic/microsoft-easy-fix-solutions-have-been-discontinued-b0f4b5f9-3b5a-bd9e-d75d-d45e2f12e16c
1. Go to control panel>programs>programs and features and in this list look for the program in question. Once you have found it right click the program and choose repair or change (if you do not have a repair option). This should allow you to run the program repair tool on the program.
2. If step one does not work and the program installer is still on your machine try letting windows re-install the program to clear this error.
3. If you don't use the program uninstall it from the Control Panel.