Well never forgot to add following PC Games in Horror Gener.
1.) Erevos
2.) Dracula
3.) Vampire Diaries
4.) Ghostly Desires
5.) Ghosts starring Christopher Lee
6.) Resident Evil 1 + 2 + 3
Also brought "F.E.A.R" yesterday which looks Horror atleast the Directors interview and the making gives me creep. Its FPS not an adventure game, a FPS set in atmosphere of the movie "The Ring" LOL
I am sure there are many other strong Horror games as well. I will check my list and will update here soon.