dinston

Just to let you know, I am having the same problem, but on XP. I have a laptop running LV 8.6.1, which when attempting to install LV 2009, I get the error: "The installation of this application may be corrupt. Use Add or Remove Programs in the Windows Control Panel to attempt to repair this program." I have tried installing from the distribution DVDs and also the downloaded version. I have tried upgrading from Win XP SP2 to SP3. I have tried uninstalled ALL NI software before each attempt, including using msiBlast.exe, as suggest by NI support to make sure everything is uninstalled. NI support provided a half-hearted attempt to help, but nothing worked. I finally gave up and re-installed 8.6.1. I had installed LV 2009 successfully on my desktop computer and had upgraded an application, but I had to downgrade back to 8.6.1 to get it to load on the laptop. My laptop is a HP Pavilion 6000, Centrino Duo 1.73 GHz, 1GB RAM, nVidia GeForce Go 7400. The only other thing I could think to try would be re-installing XP from scratch, but this would take several days because of other software which is installed. I have a lot of Rockwell software installed on this laptop, and have wondered if there is any interference. Are you running any Rockwell software?