You can find drivers for your HP ProBook 6550b on the following websites:
The HP ProBook 6550b is a machine. It is not suitable for modern heavy workloads (browsing with 10+ tabs, Zoom, Teams). hp probook 6550b driver
The HP ProBook 6550b is a legacy business laptop (circa 2010). Finding and installing the correct drivers today requires a different approach than for modern PCs. This guide explains what you need, where to get it, and how to avoid common pitfalls. You can find drivers for your HP ProBook