Oh my...I am so very sorry that happened to you fellow floof.
I know it's very scary for you that something like that happened to your computer, but I assure you along with other members and the one who commented before me Feral Heart is no virus. It is a safe game that isn't known for crashing your computer.
Though I may suggest that you my have possibly went onto a website that day, and may have caught something from there. Other than that though I would not know in all honesty. I do hope things get all fixed though.