We had issues before regarding Wrong Virus calls by anti virus programs, let it first me said that your PC is ofcourse fine, it simply is a overly protective security system.
If you cannot open it to play that means your system is blocking it from beeing executed, which would make sense if it was a virus, to fix this simply search up how to make an allowance for execution for the program in your anti virus system, you will have to find the specific way on Google as it differs quite a bit from system to system.
Apart from that, happy to hear you are enjoying the Game so far. DD is sure gonna love hearing that.