I use a free program called Faststone Image Viewer (from faststone.org) for anything that doesn't absolutely have to be done in Photoshop. I use it as my default viewer in Windows and it's got loads of features considering it's free. It's a breeze to crop, resize, change brightness/contrast/color balance, as well as draw on and label.
This is what the icon looks like so you know you're in the right place:
This is what the icon looks like so you know you're in the right place: