We do not know all the causes of the "Error loading type library/DLL" problem. It might occur if an antivirus has incorrectly marked a Legacy system file as being infected with a virus.
Restart your computer and try Legacy again. If it works, stop here.
Run your antivirus program to remove viruses and other threats from your computer.
Remove spyware from your computer. Spyware is a threat that many anti-virus applications usually do not cover.
Try temporarily disabling your antivirus program while using Legacy.
Please uninstall Legacy Family Tree completely. Please visit Uninstall - how to do a complete and totally clean removal of Legacy. Next re-install your Legacy program. Please visit https://legacyfamilytree.com/download-update and and download Legacy.
Try a Windows System Restore. For directions, please click this link: How do I do a Windows System Restore to undo changes to my computer? This may be a good option if you updated your Windows operating system or updated Legacy and then DLL error suddenly appeared.
Run the Microsoft Safety Scanner on your computer.