Delete the game folder, ignore soup miner's GCF deletion suggestion, it's useless.
Soup, not everybody has high speed connections, 400 Mb's can be a lot to certain people. While Ninja doesn't strike me as even being in that group, it's still stupid to suggest removal of the GCF, there's no point to that as you can't even modify GCF files, and in the even something actually happened to the GCF files, just validate and you're good to go, no need to completely redownload.