The first step is to find out whether your Win7 is 32-bit or 64 bit, and then go to the HP official website to download the 32-bit or 64 bit driver of Win7 for the M403 printer. The second step is to unzip the downloaded driver and save it (it is recommended to create a [Driver] directory and unzip the downloaded driver into the directory). Step 3: enter the Win7 [Devices and Printers] control panel, add a printer → add a local printer → create a new port, select the port type: Local Port, and enter the port name: the name of the computer host connected to the printer printer share name, for example: the administrative department printer. Press [OK], select [Install from Disk], and then find any. inf in the printer driver directory, for example: hpbuio160l.inf. Select it, click [Open], and press [OK] to install the driver. By the way, only the XP host directly connected to the M403d can be used normally. The shared host must be Win7 or above; If the XP host wants to share and connect it, don't even think about it. It can't be used even if it is installed.