It looks like I have the same problem. I finally upgraded G2 after many attempts. Now I have tried to install vol 3 with no luck. I went straight to the setup.exe and I get the same error to report to MS. Like the previous post, I am in SW development. I have no other problems with applications on my PC except for this one disk. I have yet contacted support to let them see for themselves the problem. Maybe they will trade me for another volume???