My computer can\'t run games very well



System Information
Time of this report: 9/23/2012, 15:27:59
Machine name: HOME-PC
Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.120503-2030)
Language: English (Regional Setting: English)
System Manufacturer: ASUSTeK Computer INC.
System Model: CM1740
BIOS: BIOS Date: 09/08/11 16:14:31 Ver: 04.06.04
Processor: AMD A8-3800 APU with Radeon(tm) HD Graphics (4 CPUs), ~2.4GHz
Memory: 8192MB RAM
Available OS Memory: 7658MB RAM
Page File: 4265MB used, 11047MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: 96 DPI (100 percent)
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7601.17514 32bit Unicode

Display Devices
Card name: AMD Radeon HD 6550D
Manufacturer: Advanced Micro Devices, Inc.
Chip type: ATI display adapter (0x9640)
DAC type: Internal DAC(400MHz)
Device Key: Enum\PCI\VEN_1002&DEV_9640&SUBSYS_84C81043&REV_00
Display Memory: 4065 MB
Dedicated Memory: 493 MB
Shared Memory: 3572 MB
Current Mode: 1440 x 900 (32 bit) (60Hz)
Monitor Name: Generic PnP Monitor
Monitor Model: SyncMaster
Monitor Id: SAM0273
Native Mode: 1440 x 900(p) (59.887Hz)
Output Type: HD15