HP ProBook 4435s Notebook-PC - Manual (Page 65)

Configuring an ExpressCard
Install only the software required for the card. If you are instructed by the ExpressCard manufacturer
to install device drivers:
● Install only the device drivers for your operating system.
● Do not install additional software, such as card services, socket services, or enablers, that are
supplied by the ExpressCard manufacturer.
Using ExpressCards 55