On PC great horror games are two oldies Nosferatu: The Wrath of Malachi and Clive Barkers Undying. If you like RE 1-3 try Code Veronica. Also:
- The Suffering good mix of horror and shooter.
- Cold Fear - big ship on middle of ocean, night, storm (great effects when you are on the deck), mutants.
- Alone in the Dark: The New Nightmare
- Cryostasis: Sleep of Reason - this one is kinda weird (you can change actions taken by characters in the past) but I liked it. Since you are on North Pole your character needs heat to survive also movements are slow so miss with rifle can cost life, etc.
- If you think that Doom 3 is scary maybe try Metro 2033 (it have it's moments) or Clive Barkers Jericho (gore to the max).