Hi foolio, thanks for getting back to me. Yes simply disabling my antivirus (ESET Smart Security 10, for anyone else out there with same issue) and now my games launch again. Cheers for the help.
EDIT: Forgot to mention, I also run Malwarebytes. I lazily disabled both this and ESET at same time so can’t specify which software was causing the problems (Probably ESET).