Microsoft Photo editor, but it's been discontinued in 2002. You need to install an older version of Microsoft Office, and be sure to include Microsoft Office Tools. Tried Gimp, it is just too weighty, and eats up a lot of memory.
Definitely check out GIMP. It works great and often out-does Photoshop.Major Plus side? It's free, as compared to a $699 Adobe Photoshop CS6 License for 1 (one) computer. GIMP is free (like I said) and you can put it on as many computers as you want.