By setting a Trusted Location in Excel 2007/2010, you can avoid having to enable macros every time the TimeTracker file is opened.
1. Click the Microsoft Office Button , and then click Excel
2. Click Trust Center, and then click Trust Center Settings.
3. Click on Trusted Locations.
4. Click on Add New Location to specify the location the TimeTracker file is saved in as a trusted location.
NOTE: Trusted locations are not available in other versions of Excel.