sorry diffret acc but it is windows that is stoping me not my antivirus
By default, Windows Security is set up to not allow third-party programs to run. It's there to catch executable viruses trying to run in the background, but will also trigger if you run a program that isn't on Microsoft's list of "approved programs". (Which is the overwhelming majority of programs.)
If you trust that this game isn't a virus in disguise, then you can just tell your computer to run the program anyway.