you might want to try adobe gamma...i think this is a freeware - just for you to test it out...
i've been using colorvision's spyder xpress and it works well...
before you do any editing though - make sure your settings in your editing program is already preset to your intended output - e.g. the intended print paper you are using...when you installed your printer, it should have also installed several paper profiles automatically - epson paper profiles of course...
- and you just have to match the profile with the paper you will be using...
Hope this helps...