Its not totally free, but a program called U-lead photo suite is obsolete now (like me) and usually sells for about 5-10 bucks anywhere.
Its very easy and very fast. I used it for years. No camera software or freeware I have tried compares.
Crop, resize, rotate, control exposure, sharpness, contrast, saturation, all the regular stuff and honestly, not as much clutter about it (options I never use) as P-Shop does.
I have a copy of Photoshop I was given (an old version), but if that doesn't happen for you try
Ulead.
yours Scott