There's a program which is very photoshop like (an exact copy) but is open source it's (and I'm not kidding here) called GIMP (graphic image manipulation program). Google it, it's free, windows compatible and works a treat.

Hope that helps. There's photoshop elements and a few others out there that are cut down versions of their bigger brothers but I use gimp on PCs, photoshop on macs.

http://www.gimp.org/