it do unzip and installed successfully but still the problem is there

Download, install, and run Everest Home Edition (CLEAN FreeWare) on this machine. Once it's finished loading and running, look under;

MOTHERBOARD
Post what is listed for your Motherboard (make/model) and the Motherboard Chipset description.

Multimedia, or, under Multimedia, PCI / PnP Audio. This will tell you what sound devices you have available on your system.

Post that information exactly as presented by the program.

Motherboard Properties
Motherboard ID <DMI>
Motherboard Name Dell Latitude C640

Front Side Bus Properties
Bus Type Intel NetBurst
Bus Width 64-bit
Real Clock 100 MHz (QDR)
Effective Clock 400 MHz
Bandwidth 3200 MB/s

Memory Bus Properties
Bus Type DDR SDRAM
Bus Width 64-bit
Real Clock 133 MHz (DDR)
Effective Clock 267 MHz
Bandwidth 2133 MB/s

Chipset Bus Properties
Bus Type Intel Hub Interface
Bus Width 8-bit
Real Clock 67 MHz (QDR)
Effective Clock 267 MHz
Bandwidth 267 MB/s

Motherboard Manufacturer
Company Name Dell Computer Corporation
Product Information Laptops, PCs, Desktop Computers, Monitors, Printers & PC Accessories | Dell UK
BIOS Download Welcome to Dell Support


under multimedia
windows audio & PCI / PnP Audio
both r empty

I just tried downloading the Crystal driver Dan gave the link to and it's a .exe, not a .zip:

C5mua09i.exe

Not sure where you got the zip file from.

If the downloaded C5mua09i.exe file doesn't fix the problem (restart the machine to be sure);

What you posted doesn't really give me the information I require, so lets go this way,,,,,

Open Everest Home Edition. Click the + sign next to;

Motherboard
Click on Chipset. Post the information listed under North Bridge exactly as it is listed.

Multimedia
Post the information listed under PCI / PnP Audio exactly as it is listed.

North Bridge Properties
North Bridge Intel Brookdale i845MP
Revision 04
Package Type 593 Pin FC-BGA
Package Size 3.75 cm x 3.75 cm
Core Voltage 1.5 V
In-Order Queue Depth 12

Memory Timings
CAS Latency (CL) 2.5T
RAS To CAS Delay (tRCD) 3T
RAS Precharge (tRP) 3T
RAS Active Time (tRAS) 6T

Error Correction
ECC Supported, Disabled
ChipKill ECC Not Supported
RAID Not Supported
ECC Scrubbing Not Supported

Memory Slots
DRAM Slot #1 256 MB (PC2100 DDR SDRAM)

AGP Controller
AGP Version 2.00
AGP Status Enabled
AGP Device ATI Mobility Radeon 7500 (Dell Latitude C640)
AGP Aperture Size 64 MB
Supported AGP Speeds 1x, 2x, 4x
Current AGP Speed 4x
Fast-Write Supported, Disabled
Side Band Addressing Supported, Enabled

Chipset Manufacturer
Company Name Intel Corporation
Product Information http://www.intel.com/products/browse/chipsets.htm
Driver Download Intel® Product Support



Mobility Radeon 7500

Video Adapter Properties
Device Description Mobility Radeon 7500
Adapter String Mobility Radeon 7500
BIOS String BK6.0.0 VR006.006.006.008.005.000.001.001 j
Chip Type MOBILITY RADEON 7500 AGP (0x4C57)
DAC Type Internal DAC(350MHz)
Installed Drivers ati2dvag (6.14.10.6378 - ATI Catalyst 3.7)
Memory Size 32 MB

Video Adapter Manufacturer
Company Name ATI Technologies Inc.
Product Information game.amd.com
Driver Download Drivers & Software


PCI / PnP Audio

when i click this or windows audio it display a grey empty window no details

The only information I got from what you posted was;

the North Bridge info, and 256MB of RAM installed. The RAM installed is very low by todays standards.

Please post the remainder of what I asked you for;

Run EVEREST and post the info under;

Multimedia
Post the information listed under PCI / PnP Audio exactly as it is listed.[/COLOR]

im telling u the under this section u asking about is empty it displays an completly empty grey screen it doesnt display anything

I've waited to see if you could resolve your problem with the information and file downloads provided. What you need (according to the info you supplied) is all here. (Post #8.)

still i cudnt resolve it

and sorry i cudnt get what u said where i cud get my solution