Back to Win7 PPT 2007 to XP PPT 2003 Problem?

I created a ppt show under win7 for student version of PPT2007. It won't
fire up on my XP with PPP2003 (Pro). That is, pressing F5 gets nowhere.
Per the last go round on this a month ago, I converted the file on 2007
to 97-2007. That doesn't work either same F5 problem. Any ideas? This is
not a complex slide show. Maybe 20 images, and 6 pages of bulleted text.
--
Wayne Watson (Watson Adventures, Prop., Nevada City, CA)

(121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
Obz Site: 39° 15' 7" N, 121° 2' 32" W, 2700 feet

Solid waste produced to generate electricity per person
over a lifetime:
Nuclear power -- 2 pounds in a coke can
Fossil (coal) fuel -- 68.5 tons in six 12-ton RR cars

-- Power to Save the World, Gwyneth Cravens

Web Page: www.speckledwithstars.net/