Unwanted install

> When I open certain applications, including any MS Office application and
> Internet Explorer, a window pops up saying it is about to install either MS
> FrontPage or Macromedia Contribute. I keep having to click "Cancel",
> sometimes 5 or 6 times before it goes away. Sometimes it will shut down the
> application I have trying to open and ask me whether I want to send an error
> message to MS. Sometimes it even starts this install process when I go to
> certain Websites. I have not found any settings in these two applications
> that will turn off this nagging problem. Any advice will be appreciated.
> --
> Billy