As it has been stated many times on the forum and other places on NI's web site, the first version of LabVIEW to be officially supported on Vista is 8.2.1. You can try the existing run-time and see if it works. If you use any hardware (GPIB, DAQmx, VISA, etc.), you will have to install the latest drivers for those because the versions that came with 7.0 will certainly not work.
