Safest executor? Have no idea where to start!

So I'm trying to find a way to script on slap battles specifically. I've set up some autoclickers but they just aren't getting the job done. I've done some research on executors as I think that's what I really need. Problem is a consensus on which to use doesn't seem to exist. Is there such a thing as a malware/virus free executor? How do I go about exploring this whilst not risking the integrity of my pc? Any help greatly appreciated