Here is link download driver for Toshiba Satellite C640, hope this post may help , thank you..
BIOS Update Download
Bluetooth Filter Driver Download
Bluetooth Stack Download
Card Reader Controller Download
Chip Set Utility Download
Display ATI Driver Download
Display Intel Driver Download
Display nVidia Driver Download
Intel Management Engine Interface Download
LAN Driver Download
Rapid Storage Technology Driver Download
Sound ATI Driver Download
Sound Conexant Driver Download
Sound nVidia Driver Download
TEMPRO Download
Touch Pad Driver Download
Webcam Driver Download
Wireless LAN Indicator Download
Wireless Lan Driver Download
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