Can't print or save from PowerPoint 2002 (XP) or 2003
Office 2002 (XP) and later require you to "Activate" or register your software with Microsoft.
Until you do this, it'll act normally for a limited number of sessions, then it goes into "reduced functionality" mode.
In reduced functionality mode, you can open and view your documents but not print or save them. In effect, PowerPoint becomes a demo version until you register it.
Activate Office or PowerPoint with Microsoft to get back to full functionality. Start any of the Office apps (Word, PowerPoint, Excel, etc.) and choose Help, Activate Product.
If your software has already been activated, you'll see a message telling you so. Otherwise, you'll get instructions for activating the software over the web, by phone, etc. You only have to tell MS the country you're in when you activate. All other information is strictly optional.