u/DrawnToIceland

I returned from a trip in March, only to realize that I had accidentally left the setting dial on my DSLR in the wrong position. The pics looked ok in the preview window on the camera, so I never noticed. But when I uploaded them onto my PC at home, they all have a blue hue. Is there a relatively simple way to fix this and restore more natural colors? I only have access to free programs. I have an old version of Photoshop, but it's a disk and I no longer have a disk drive to install it. I've been trying and I just can't get it right. Any advice?