I haven't used Windows 8, but can you still just right click the photo and do it from there? An often overlooked and simple way to resize with prior versions of Windows was to right click the intended photo, then select "Open with." Next, click "Microsoft Office Picture Manager." Then under menu choice "Picture" select "Resize" and then either enter a pixel size you want or use the Percentage of original width x height. Good luck, I usually just quickly give up and then call one of my kids with anything computer related.