Do have a regular version of PowerPoint installed or just the PowerPoint
Viewer. The behavior you described is what the Viewer does. It is also
the behavior of PowerPoint Show (.pps).
If you don't have PowerPoint, and you want to edit presentations, you
will have to buy a copy of PowerPoint.
If you do have PowerPoint and are trying to open a .pps file, you can
either change the extenstion of the file to .ppt and open it, or you can
open PowerPoint and then open the file by choosing Open from the File
menu.
If you have PowerPoint, and the file is not a .pps file, then you
probably have an error in the program assigned to open .ppt files. In
that case, you can open the file by starting PowerPoint and choosing Open
from the File menu, but you will also want to fix your file associations.
Check out "Changing a File Association" from the PPT FAQ:
http://www.rdpslides.com/pptfaq/FAQ00355.htm
--David
--
David M. Marcovitz
Director of Graduate Programs in Educational Technology
Loyola College in Maryland
Author of _Powerful PowerPoint for Educators_
http://www.loyola.edu/education/PowerfulPowerPoint/