If you have just made some tweaks to the program, and not changed any of the add-ons, like a new version of DAQ-mx or LV 8 runtime over LV 7.1 runtime, you should be able to just replace the .exe and the associated files that are built when you build the .exe.
I have done this for numerous applications that we have, that way you dont ahve to uninstall and reinstall.
Kenny
Kenny