Good PC Horror games

I'm in the mood for some good PC horror games. I was looking to get Penumbra, but my laptop can't run it very well. I'd prefer something a bit older, if possible. 
 
I've played System Shock 2, and I'll probably play Undying. Is there anything else worth playing?
 
Here's the laptop I'm using by the way:
LINK

Amnesia: DD

" Amnesia: DD "

Theres Silent Hill 2, 3, 4 and 5 and of course The Suffering 1 and 2. 
I highly recommend playing this ones.

@Jayross said:

" Amnesia: DD "

It doesn't work with Intel Graphics cards. I already own it but can't play it :(
 
@mylifeforAiur:  I'll check those out, thanks

Call of Cthulhu: Dark Corners of the Earth is awesome, Penumbra, Cryostasis,  
 
If you're looking for a good tense or creepy atmosphere, F.E.A.R. is pretty good. Sanitarium, Lost Crown, Dark Fall.  
 
That's all that comes to mind right now, aside from what's already been mentioned.

Fear, silent hill 2, 3.

Depends on what you're looking for. You know what I just played recently? Yume Nikki. Shit is fucked up.

• Alone in the Dark (despite the reviews, I'm playing it and it is pretty good)
• Condemned
• Obscure 1 & 2
• Dead Space
• Fear 1 & 2
• Bioshock 1 & 2
• Sanitarium
• Resident Evil 1-4
• Silent Hill 1-5
• Nocturne
• Clive Baker's Undying

since you already have Undying in your queue...how about Condemned? It draws a lot of influences from Se7en the film, which is great. The game is rad, a lot of hitting hobos with pipes.

Scratches, Darkfall: Lost Souls, and Call of Cthulhu: Dark Corners of the Earth are my best suggestions. Scratches has so much atmosphere it is easily my favourite of the suggestions.

Thanks for the suggestions everyone.
 
I think I'll go with Cthulhu first, since it's on Steam and I like Lovecraft. I'll keep track of this thread in case I ever need ideas on what to play though.