I think you are seeing the prompt in Windows 7 asking if you the Norton Removal Utility worked or did not work. The dialog box will say something "This program worked", "Install using recommended settings" etc.
If so, that it a compatiblity prompt only on the program/tool/utility that you run in Windows 7. You should choose it is installed since it worked. Hopefully Microsoft will re-word it properly next time by saying "the program worked or did not work" instead of "install or did not install" since you are not installing anything.
A friend and I have just bought two new computers, Hp p6320y with windows 7 64bit. It came with a trial Norton which both of us wanted to remove. I downloaded the remover from the web site. I first uninstalled it then ran the remover to be sure it was all gone. Both times this alert box which I have just started seeing with windows 7 came up after running the remover. It said something about did this program uninstall or install properly, not sure if I remember which. There were three choices. Not seeing this before and not knowing why it was showing up I just hit cancel. Everything seems fine but I just want to know what this was and what I was suppose to do so I will know for the next time. I have done a lot the last two weeks and could be confusing this with removing something else but am kinda sure it was Norton Internet Security. Hope some one else has seen this. Thanks Also it seems like it was something with windows as the remover looked like it was finished.