CS3 uses some of the same registered libraries as Messenger (particularly if you are installing Bridge). In the early Betas of CS3, Microsoft pushed out a new version of Messenger that caused many parts of CS3 to break. The installer is probably just making sure that it isn't going to run into the same issue.
-Nick Kwiatkowski
MSU Telecom Systems
Manager, Michigan Adobe Flex User's Group & Asstn. Manager ColdFusion User's Group
OK, this is just a puzzlement. When trying toi install Adobe CS3, a dialog box tells me I must close IE, Word, and Windows Live Messenger.
I can understand Word, because it probably wants to install a PDF print add-in. I guess IE for the same reason.
But Messenger? Huh?
Maybe it's a ghostly occurrence. Happy Halloween!
/rich