Vista - Picture Preview?

Hi, I'm sorry if this has been covered already..I just couldn't find an answer to my question..so here's hoping I find one here!

When I preview a picture (right click + preview) windows photo gallery pops up as the default previewer..but it makes my photos way darker than their normal shade.
When I use another program like photoshop or paint..they're normal. But again, when I right click and preview them, they are several shades darker than the original.
It's not too big of a deal, but if there is a solution I'd deffintely try it!

thanks to anyone that can answer!