HP drivers
From WPKG | Open Source Software Deployment and Distribution
Most HP drivers (audio, graphics, keyboard, network, input devices etc.) come as InstallShield packages. The installer usually have name like sp<number>.exe, for example, sp32556.exe is the name for Broadcom network drivers.
Sometimes, it will install silently with a /s switch, i.e.:
sp32566.exe /s
Unfortunately, in most cases manual intervention is needed (i.e., using other InstallShield switches, recording the installation etc.), so there is no golden rule here.
Most HP installers save its data into C:\SWSetup.
Sometimes, after starting the installer, you will find an extracted MSI package in %TEMP%.