Hello,
What is the error message it gives you when it stops? Where the data is stored depends on your version of Windows, but I would try repairing the database first. If you're running Windows Vista of Windows 7, click the start button in the bottom left and type "Database Repair Utility" . If your running Windows XP, click the start button in the bottom left, and then click run, and type CMD. In the command prompt window type C:\program files\eclipse\logbook\eclipselogbook.exe /repair If Logbook still won't open after that I would go to www.logbook.com and click on the CHAT NOW button on the right side. It sounds like it could be an issue with your .net framework. Hope this helps.