http://en.wikipedia.org/wiki/GIMPshop
TL;DR: Don't link to gimpshop.com
If you really want it (even thought the last update is from 2012), get it from http://sourceforge.net/projects/gimpshop.mirror/
Shit! I didn't check the download, Sorry!
The legit version is here. (sourceforge)
So sorry about the bloatware, I installed GS two years ago, so I googled it again, and must have given you a bad link.
Here's AdwCleaner (This time, with a link that I had bookmarked ICA)