Before you import the photos into your project, go to your preferences (under the Edit menu on a PC) and uncheck Scale Stills to Frame Size.
Also make sure your photos are sized to no larger than 1000x750 pixels or they are going to be way to large to work with. You may need to resize them once youv'e added them.
Unless your concern is that the portrait photos are coming in sideways. If that's the case, you'll need to open them in Photoshop Elements, rotate them 90 degrees and then resave them. Note that, although many photos will appear to be oriented correctly in the Organizer or in Windows, they still may not actually be oriented correctly until you open them in Photoshop.