If you are looking for available drivers or software related to your HP ProBook 4540s laptop. The following software and drivers are compatible with your HP ProBook 4540s and Microsoft Windows 7 32/64-bit.
HP ProBook
HP ProBook 4420s Drivers For Windows 7 (64-bit / 32-bit)
Built for everyday tasks, the ProBook 4420s Notebook from HP is ideal for users looking to browse the Internet, create and edit documents, and stream TV shows or movies.