Does it flag which runtime it is? Vue 5 installs a few of the Visual runtimes; before committing SP2, you might want to find which ones Vue 5 installed, goto the MS site and download those specific runtimes, and install them to see if that solves the problem. 'Version-itis' is a real PITA with the .dll's, and you may have had an incompatible runtime that XP has decided it will keep over all others....