Dell Latitude c540/640

try Ebay, some seller ships worldwide.

If youre windows vista is 32 bit then you can just go to support.dell.com and select your type of computer, then just download the sigmatel driver under audio.

Recently I discovered that my laptop latitude C640 Sound and VGA is malfunctioning. I intended downloading the drivers trial version but could not do so. pls help I'm a student and I don't have money to buy a new one

hi,
check if any updates are availble for the bios
go to support.dell.com > drivers and downloads > put in your service tag and check if any update is available you can update your bios

you can also try restore your bios to factory settings you have an option for this in the bios menu as well and then connect the drive and then boot.

Further Queries are welcome
if you think my solution was helpfull please do rate me

OK I see C640 and C540 I will give you the link for the C640 go download your drivers burn a CD of of all your drivers for XP for this laptop then you will always have them. here is the link I think you need.
http://support.dell.com/support/downloads/driverslist.aspx?c=us&cs=19&l=en&s=dhs&ServiceTag=&SystemID=LAT_PNT_P4N_C640&os=WW1&osl=en&catid=&impid=

Assuming you are using Windows XP
Crystal Driver
Applies to
CS2405
Download Dell Latitude C640 Audio Driver

I hope this resolves your problem

In case you need any other drivers for the same model or different operating system
Download other Drivers

All the best

http://supportapj.dell.com/support/downloads/driverslist.aspx?c=in&l=en&s=gen&ServiceTag=&SystemID=LAT_PNT_P4N_C640&os=WW1&osl=en&catid=&impid=

download drivers from here

Hi

Both Dell Part numbers 18THT and 5W299 are 8X DVD-ROM Drive Modules. DPN 18THT is compatible with Latitude C series and DPN 5W299 is compatible with Latitude D series. The two drives have different and incompatible connectors.

Your Latitude C640 is a C Series Latitude. You can therefore not use DPN 5W299.

If you need a DVD drive module, get DPN 18THT or an alternative Latitude C series drive.

Mike

i installed windows xp service pack 3 in dell c640 latitude laptop after which the multimedia audio controller driver is not installed.

http://support.dell.com/support/edocs/systems/latc640/sm_en/upgrades.htm#999869

this link would be helpful