To be able to install older devices that are not auto-detected by the system (non-plug and play devices), you need administrator credentials. It is recommended to start with the manufacturer’s updated installation software and follow the instructions provided. Many times this is not possible, either you have lost the original media or the manufacturer does not support the device anymore and hence, does not provide any software packages. However, you can install non-pnp devices from the device manager . An Add Hardware Wizard helps you installing these devices.
From the device manager, right click the computer name at the root of the tree in the details pane and click Add Legacy Hardware
If a device driver package is not signed with a trusted certificate then the user installing the driver needs administrative privileges to be able to complete the installation. You can allow ordinary users (non-administrator user accounts) to install specific drivers that do not have a trusted digital signature by adding them into the driver store. The driver store is a protected area that contains device drivers’ packages that have been approved for installation on the computer. Sometimes, this process is known as staging a driver package.