Thank you for your suggestions. I've not been able to use either suggestion as I will explain. With Mark's suggetion:- the file is an icon within the MS Vista welcome centre, and doesn't behave like other files, when I right click on it there is only the option to OPEN, which if I click on tries again with MS word. Mark's suggestion would I am sure work but I have no idea of the files name or where it is to be found. I tried to search for it but wasn't able to locate it.
You don't have to trouble yourselfs anymore, because as I am sure you know, Vista has different users as a security measure. I was having the trouble in the user I use most of the time(low security protocol), however for some reason I went into the admin user side and when I tried the manual, Reader opened it fine. So why it opens it with Reader for one user and with word for the other, who knows? But I have been able to access the manual.