Under LabView 5, goto the front panel of the VI, right-click on the icon for the VI in the upper left-hand corner of the window, and select VI Settings. In the drop-down list at the top of the screen, select Execution Options, then check Run When Opened. Re-save the VI and rebuild the exe.
After that, work on justifying a LabView upgrade! If you're doing development work, the productivity improvements alone will pay for the upgrade: you can do a lot of things faster in LabView 6 and 7 than you could in 5. Plus, support will become an increasing issue. There are fewer and fewer people around who still have LabView 5, so there are fewer people who will be able to answer some of these version specific questions.