Choose and then Let me pick from a list of device drivers on my computer .

Right-click and select Manage , then open Device Manager . Locate the scanner under Imaging devices or Other devices . Right-click it and select Update Driver Software .

To install the on Windows 7 , you must primarily rely on manual installation methods or third-party drivers, as HP does not offer official software for this model on Windows 7 .

Ensure your scanner is plugged into a power outlet and connected to your computer via a .

: A third-party application that supports many legacy scanners, including the HP ScanJet 3500c , even when official drivers are missing .

Wait for Windows 7 to attempt to identify the device. You may see a "Installing device driver software" notification in the taskbar. 2. Method A: Use Windows Update (Recommended)

Choose to refresh the list of available drivers. Search for "HP" under manufacturers and look for the HP ScanJet 3500c or a similar series (like 3500 series) . 3. Method B: Install in Compatibility Mode