Fomatie compu, calidad pantalla bajo, se ven pixelados

Hola! lescuento que formatie mi compu, porque necesitaba que sea de 64bits(era de 32) la cuestion es que despues de formatiar la calidad de la pantalla bajo bastante; los iconos se ven un poco mas grandes y menos definidos y los videos tambien se ven mas pixelados.
La resolucion es la mas alta de las opciones de pantalla que me da windows, supongo que faltara algo respecto a la tarjeta grafica.....drivers o no se,,,,,,
si alguien sabe como puedo hacer para que se vea bien de nuevo, se lo agradeceria muuuucho!!!!
desde ya muchas gracias y saludos!

adjunto el informe de DxDiag
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System Information
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Time of this report: 8/28/2013, 16:28:02
Machine name: MARIAN-PC
Operating System: Windows 7 Ultimate 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.130708-1532)
Language: Spanish (Regional Setting: Spanish)
System Manufacturer: Hewlett-Packard
System Model: HP Compaq 6910p
BIOS: EPP runtime BIOS - Version 1.1
Processor: Intel(R) Core(TM)2 Duo CPU T7500 @ 2.20GHz (2 CPUs), ~2.2GHz
Memory: 4096MB RAM
Available OS Memory: 4032MB RAM
Page File: 1745MB used, 4284MB 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

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DxDiag Notes
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Display Tab 1: No problems found.
Sound Tab 1: No problems found.
Input Tab: No problems found.

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DirectX Debug Levels
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Direct3D: 0/4 (retail)
DirectDraw: 0/4 (retail)
DirectInput: 0/5 (retail)
DirectMusic: 0/5 (retail)
DirectPlay: 0/9 (retail)
DirectSound: 0/5 (retail)
DirectShow: 0/6 (retail)

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Display Devices
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Card name: Tarjeta gráfica VGA estándar
Manufacturer: (Tipos de pantalla estándar)
Chip type: ATI ATOMBIOS
DAC type: 8 bit
Device Key: Enum\PCI\VEN_1002&DEV_7188&SUBSYS_30C1103C&REV_00
Display Memory: n/a
Dedicated Memory: n/a
Shared Memory: n/a
Current Mode: 1152 x 864 (32 bit) (1Hz)
Monitor Name: Monitor PnP genérico
Monitor Model:
Monitor Id:
Native Mode:
Output Type:
Driver Name: vga
Driver File Version: 6.01.7600.16385 (Spanish)
Driver Version: 6.1.7600.16385
DDI Version: unknown
Driver Model: desconocido
Driver Attributes: Final Retail
Driver Date/Size: 7/13/2009 20:38:47, 15360 bytes
WHQL Logo'd: Yes
WHQL Date Stamp:
Device Identifier: {D7B71EE2-32C8-11CF-8D33-710DAEC2CB35}
Vendor ID: 0x1002
Device ID: 0x7188
SubSys ID: 0x30C1103C
Revision ID: 0x0000
Driver Strong Name: Unknown
Rank Of Driver: Unknown
Video Accel:
Deinterlace Caps: n/a
D3D9 Overlay: n/a
DXVA-HD: n/a
DDraw Status: Not Available
D3D Status: Not Available
AGP Status: Not Available