Hey jakjon24, thanks for reaching out and welcome to forums!
I am away of the current give-away of ours with Far Cry 3 and it appears that you have managed to successfully claim it, therefore I am unsure how it may appear in gray, as it will normally be only the content you do not have access to.
As far as reinstalling, by saying latest activity, do you mean that all of your save files are gone and you have to start all over?
Let us know and we will take it from there!