[mura_gadi (Steve)]

You can do a cheap colour calibration using your windows drivers, if you have control over the gamma settings. There are 3rd party apps and if you own a dedicated video card you'll have settings there as well. Gamma controls your RGB, its not a colour calibrated monitor but a lot cheaper.

Print the photo in a small page at a lower and lower rez. try 200dpi 1st, that will let you judge how low rez you want to go. Then its DPI x camera rez for how many inches per side you can expand too (4000x3000pixels = 20"x15" at 200dpi).