Stuttering ruining immersion

[PACMAN79]

I'm getting stuttering before events happen and at alot of random times also. When its running smooth it's awesome but then I get the stutters and it totally ruins the experience. I have tried checking the integrity on Steam numerous times and it always comes back successful. I have tried reinstalling the game alot of times now and here is the weird thing

PLEASE NOTE - After the game is first installed it runs really smooth on the first playthrough. I then exit and save. Go to play it later and it stutters? Even if I start from the beginning again it stutters? Only when I reinstall does it appear smooth on that first initial playthrough.

Just thought I would see if anyone could help me here and perhaps get to the root cause of the issue.

Information -

FX 4100@4.5GHz
ASUS M5A99X Evo Rv 1 Motherboard
2x2GB Corsair DDR3
GTX 660 Twin Frozr III OC
WD 640GB Caviar Black 64MB Cache HDD
Corsair TX850M PSU
Realtek Sound Drivers - 2.70
1080P Monitor@60Hz

Nvidia Driver - 310.90
Windows 8 Pro

Many thanks in advance