Hmm, I'm not familiar with the MS Photo Editor ... I tend to save files as *.jpeg and print from Adobe Photoshop (but that's because the AutoCAD/CorelDraw/Illustrator files I create are otherwise so big the university plotters take hours to process them).
Do your college printers not run PaintShop? If they do, I would print from that. Failing that, follow my advice in the first post and try to find the view option that toggles the printer margin display. Most Microsoft utilities should have it somewhere in the 'View' drop-down menu.
Standard A4 size is 210mm X 297mm. If your image is less than 195mm x 280, it should fit on any printer. However, you still have to toggle off 'scale to fit', or it might stretch the image.
Hope this helps. Your best bet might be to ask your friendly neighbourhood college IT boys, though - I've always found them very useful (although I wouldn't want to meet one in a dark alley).
Out of interest, why are you concerned with re-scaling when you print? Table-top floorplans?