I have the new Toshiba Qosmio F750-12C with a Geforce GT 540M graphics card and running a x86 system. My current driver version is 268.07 and i want to update to the current driver version however, Nvidia tells me the message "The driver installer did not find the necessary graphics material" (translated from french)
You shouldn't be installing drivers direct from Nvidia, get the correct driver from the Toshiba site which I suspect is the one you have now.
As part of the NVIDIA Verde Notebook Driver Program, this is a reference driver that can be installed on supported NVIDIA notebook GPUs. However, please note that your notebook original equipment manufacturer (OEM) provides certified drivers for your specific notebook on their website. NVIDIA recommends that you check with your notebook OEM about recommended software updates for your notebook. OEMs may not provide technical support for issues that arise from the use of this driver