GTA 4 lagging on Alienware M15X

Hello,

I'm wondering why my laptop can't run GTA IV at a reasonable framerate. My laptop is an Alienware M15X, bought just this summer. It usually runs games pretty well (for example, Crysis, Battlefield: Bad Company 2, Fallout 3, Batman Arkham Asylum, FEAR and GTA San Andreas run very smoothly at high graphics or higher).
When I started up GTA IV, it ran at approximately 5 FPS. I have updated my drivers, and I started using GameBooster v.2.2, I read it could help. My framerate went from 5 to 10, but still, I have to put it in 800x600 and put all of the settings at the lowest.

I'm still researching on the Internet, I downloaded patches from Rockstar (without any noticeable effect), and I'm starting to think maybe I just wasted 20$ on a game I can't run properly. Can anyone help me?


Thank you,


Nazsha


Statistics
Average FPS: 10.74
Duration: 37.71 sec
CPU Usage: 55%
System memory usage: 34%
Video memory usage: 30%

Graphics Settings
Video Mode: 800 x 600 (60 Hz)
Texture Quality: Low
Shadow Quality: Low
Reflection Resolution: Off
Water Quality: Low
Texture Filter Quality: Tri-Linear
Night Shadows: Off
View Distance: 1
Detail Distance: 1

Hardware
Microsoft Windows 7 Home Premium
Alienware M15X
1600x900 screen
Installed memory (RAM): 8.00 GB
Video Adapter: NVIDIA GeForce GTX 260M
Video Driver version: 260.99
Audio Adapter: Speakers / Headphones (IDT High Definition Audio CODEC)
Intel(R) Core(TM) i7 CPU Q 720 @ 1.60GHz