Are haunted/cursed games a common fear in children? I recall a recurring nightmare where my Sim Town game was corrupted or cursed. Having all of the game rules become inverted was terrifying for some reason.
For what it's worth, I experienced the same sort of nightmares, though it typically wasn't a specific game or program, more like the computer being hacked/compromised/haunted.
As a child I only once remember fearing a machine - the local dry cleaning machine. That thing was a tubular tentacle monster to a child. I feared people a lot more and felt that machines were predictable as they were not biological therefor could not be possessed or haunted. I also have no fears of supernatural beings nor do I have religious inclination to fear a gods/demons/spirits/etc. People are the real monsters.
I've always had nightmares about technology misbehaving, but I blame it on my childhood Mac being one that would sometimes start up with with the screen inverted, the "happy Mac" icon replaced with a dead sad Mac, and the sound of a car crash. The machine that usually follows specific rules randomly deciding to scare you definitely builds some anxiety.
Not a game, but where i live, stories of haunted smurfs toys (or clothes!) that killed their owners where pretty popular, and definitily scaried me when i was a child (we had a tiny smurf action figure and a sega genesis cartdrige of the smurfs game)
Ghostbusters on the NES was fear inducing as an 80's kid, then came Resident Evil on the PSX.
Fear inducing through the anxious environment created on purpose by the gameplay itself or the fear that the game would do something super-natural?