3. If the error continues then you can try a registry repair. There are several utilities available to do this. Some cost money and some are free. We have had success with Ccleaner from Piriform. You can download the free version at http://www.piriform.com/ccleaner/download.
4. Restore your computer to a point before Legacy stopped working. Consult you Windows help system for the steps to do a Restore Point. Try Legacy again.
If you continue to have problems, please contact Support through the Problem Report Form on our website at http://www.legacyfamilytree.com/Problems.asp or email to Support@LegacyFamilyTree.com.