left 4 dead 2 won't run

Video card, CPU.
 

My Computer My Computer

At a glance

Windows 7 Home Premium 64bitQ66004GB.Sapphire Vapor-X 5750
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Acer M5641
OS
Windows 7 Home Premium 64bit
CPU
Q6600
Motherboard
Nvidia MCP73PV
Memory
4GB.
Graphics Card(s)
Sapphire Vapor-X 5750
Sound Card
XFI Extreem music
Monitor(s) Displays
Acer X223W
Screen Resolution
1680x1050
Hard Drives
WD10 02FAEX
WD64 00AAKS
PSU
stock 450w
Case
acer
Cooling
stock
Keyboard
Microsoft Digital Media Pro.
Mouse
Logitech MX620
Internet Speed
49.51Mbs down 4.98Mbs up 17.6ms ping
Antivirus
MSE
Browser
Waterfox
Other Info
Shaw Cable
Netgear R6200
guys...where can I download C++...I have the same problem with L4D2, maybe dowloading C++ could do the trick
 

My Computer My Computer

At a glance

MS Windows 8Intel Core i5 @ 2.27GHz Arrandale 32nm Techno...8.0GB Dual-Channel DDR3 @ 532MHz (7-7-7-20)ATI Mobility Radeon HD 4300 Series (Dell)
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Dell inspiron 1564
OS
MS Windows 8
CPU
Intel Core i5 @ 2.27GHz Arrandale 32nm Technology
Motherboard
Dell Inc. 0M9XW4 (U2E1)
Memory
8.0GB Dual-Channel DDR3 @ 532MHz (7-7-7-20)
Graphics Card(s)
ATI Mobility Radeon HD 4300 Series (Dell)
Sound Card
Realtek High Definition Audio
Monitor(s) Displays
Generic PnP Monitor on ATI Mobility Radeon HD 4330
Screen Resolution
1366x768 pixels
Hard Drives
1 tb TOSHIBA (SATA)
PSU
built-in
Case
Dell Laptop
Cooling
built-in
Keyboard
built-in
Mouse
Dell Touchpad/Microsoft Arc Mouse
Other Info
Snake Laptop Skin, Detachable Alfa USB wifi with custom 15dbi antenna (for better signal range)
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