What format are the pictures? Alot of people use different graphics programs - but all that stuff is really easy just with just Microsoft Paint.. Right-click on the image, and under "Open with", select "Paint".. If you want to change the size of the pic, at the top click "Image", then "Stretch/Skew", and on the top for Stretch, change the Horizontal and Vertical percentages.. If you put 50% and 50%, the image will be twice as small.. So you can make it any percentage smaller, and also bigger if you wanted..
Then to reduce the file size, click "File", then "Save as", and save it as a "jpg".. This should definitely reduce it below a megabyte.