1. Installing the latest LabVIEW patch. 2. Reinstalling LabVIEW being sure you completly get rid of all folders, registry entries, etc.. when you unistall.
One question to help us: What version of LabVIEW are you running?
Thank you very much. I installed without deleting all folder at first. reinstalled also can't work. after it, I deleted all folder and software. it works. I am using LabVIEW 6.1