You might like to look at Convert PowerPoint Presentation to Word Document with Win32::OLE. Once in Word, you probably can export the page as an image.

As a fast (or last :-) ) solution, you could use ImageMagick's import, or some other win32 screenshot program to grab a fast screenshot. The way import works, is you execute import, then a little crosshair appears as the mouse pointer, which you click in the window you wish to save....all very easy if you just want a few images.