Well, the obvious answer would be to close them once with saving and it will never ask again. Most likely, the situation occured because you upgraded LabVIEW to a new version. (you can find the exact changes from the dialog, so please verify this before proceeding).
What you can also do is masscompile your folders. Currently, LabVIEW needs to convert all your VIs every time you load them, a slow process that is also demanding on CPU and memory. You should really have all your code in the current version (after backing up the old versions in a safe place, just in case).
Message Edited by altenbach on 08-29-2007 09:13 AM