you couldn't know and besides it was not your fault that a virus essentially attached itself in your machine, regardless if you think nothing is wrong.
however give it enough time, as with all viruses, it learns and adapts and they were designed that way, eventually you will get problems later on.
as for stormkeeper, pirated software the stuff i download if i have no where else to turn if i can not find it anywhere, the people who create the cracks, also remove files to end any conflict, however some of them are stupid enough to upload another one into the game the moment you play it. the risks are always their and you know the dangers even so, its not a question of being worried more a question of when will the next computer format come and begin again.