Photoshop Elements :: Making Small Photos Larger To Be Used In Slideshow

I am using Photoshop elements 10 with windows 7 on my Toshiba laptop.
 
I am trying to make a slide show of photos for my brother's funeral. The photos will be shown on a screen at the church and on a TV monitor at home. I was used to Photoshop 4, but had purchased but not really used Photoshop Elements 10. I am about 1000 miles away from home so I cannot go back to try to using Photoshop 4 which is not on this laptop.  I don't think I want to change (i.e. resample) the pixels, etc.
 
I have put into order all of the photos.  However,  the photos are of varying sizes.  The photos taken digitally are fine.  However, I have a lot of photos take a long time ago for like 3X3 or 2X3, i.e. like in the 50's - 90's, which were scanned. Then provided to me in a variety of ways. Coming to me they are small on the page. ie like in one corner. I am not trying to shrink these photos.  I am trying to resize them larger.  And probably get rid of most of the white background.