As posted just prior to yours:
Well, you can't actually "convert" a Word document to a presentation file,
but you can bring the content in from a Word document in several ways.
Perhaps the one your looking for is on the Home Tab of the Ribbon. Click the
bottom part of the New Slide button & select Slides From Outline... Assuming
that the Word file is properly constructed as an Outline for the task.
There is also the option of inserting the Word file as an Object. For that,
go to the Insert Tab, click Object in the Text Group & select the Create
from File option, then Browse for the Word file.
Please search the group for answers before posting a question - the odds are
the answer is already there. Also, Window Vista is your operating system &
tells nothing about which version of Microsoft Office you might be using.
