I've never played those two games, but I know for a fact that Uninvited and Call of Cthulhu: Dark Corners of the Earth scared the crap out of me.
Uninvited might not be quite as scary to those who never played it though...I recently replayed it, and it still seemed to have a good effect on me, but maybe only because it brought back so many childhood memories of screaming and running away from the Mac?
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I'll brave the storm to come, for it surely looks like rain...