Bring the picture into a image editor like photoshop or photoshop elements. If you don't have neither one you can find free lower end image editors online.
Here's one: This one you can edit directly online
for this one you can download free. Its a pretty decent for a free image editor.
Hope this helps!!!!
you can use the microsoft office picture manager to reduce the memory size of your pictures.
You can also download Pixresizor which is a good one or another one I now use all the time is called web resizor. Both are freedownloads
Just open the photo in paint and press ctrl+s. TA DA!!! you are done!!!