Hello, I've tested using the FramePkg_upd.exe to upgrade Agent 3.5.5 to 4.0 on XP without any issues. I can run it with silent switches and it all updates successfully. When I'm trying it with Vista, no luck. Sometimes, if I manually install it, it will work, but not all of the time. I'll receive the message "The setup must update files or services that cannot be updated while the system is running. If you choose to continue, a reboot will be required to complete the setup.". Now, in the past, when installing anything with silent, the install will finish during reboot if files are being used, but that doesn't seem to be the case with Vista. I've also check that we have remote registry enabled and also UAC is not enabled. Has anyone run in to this before, and if so, is there anything I'm missing? Thanks in advance for the help!