USB Drivers W7 after re-install

Nspire Black Edition Model N1581 NNB-A98 Searched this forum and found archives but refer to chassis build? Could you please point me in right direction. I have managed to track all other drivers bar this one.
thank you

http://www.e-weekly.co.uk/download/RnD/DRIVERS/PEGATRON/C15B/C15B_Win7.zip

Please find download link above for all drivers for your Chassis.