You can't modify the software but, if you've got a suitable Windows installation disk (and don't mind paying for some decent 'emulator' software) you can install Windows onto your Mac:
http://www.lismoresystems.com/en/
However most people don't need the software that comes with their digital cameras anyway. Simply using a cheap card reader will allow you to transfer your images to your Mac. (Hopefully you were doing that anyway with a PC. Downloading images by connecting the camera to a USB port, and using dedicated software, is slow and unnecessary).
If your Mac is running OS X you can use GIMP (which is a free open source program akin to Photoshop) to edit your images:
http://www.gimp.org/macintosh/
or, for a simpler (but still highly-praised) image manipulation program, use Google's Picasa:
http://download.cnet....-2193_4-10906661.html
There are so many free online dictionaries available that you don't really need dictionary software. I like this one:
http://www.sequencepu...com/thesageonline.php
Chris