Sorry to bump such an old thread...
but,
@mohdumer; that is for installing the USB flash driver on x64... Not your standard W800/K750 drivers.
The link that japan6 posted:
File Type: rar 750_USB_x64_Drivers.rar (396.5 KB, 175 views)
Works perfectly!
Extract all files, then copy every file from every folder to one single directory..
Once done, install driver, and select to search from that directory.
it works perfectly!
Thank you!!