No, it is not a demo, but the full program mailed to me by Curious Labs themselves. Comp = Windows 98, 1.6 GHz Pentium 4, 512 MB DDR SCRAM, 80GB HDD, 32MB graphics. Purchased P5 in Feb/Mar, ran fine. Lots of fun! :D Then, in Apr, she locked up on me while revising (in work room, not file editing) a saved document, and she has not fully opened since. She hangs at the "credits" page. I have tried (in order): uninstall + reinstall (twice) scan disc + defrag + reinstall uninstall + d/l SR-3 + reinstall uninstall + reinstall + "run" Sr-3. Contacted CL Tech Support in Apr - might have trashed reply with 1200+ spam (was on vacation). Retransmitted to Tech Support last Sat and to Customer Service today. I am hoping someone in the community can help me.