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Using a wireless USB network card is an effective solution when the built-in wireless network card is no longer functioning. These USB network cards are portable, easy to install, and typically do not require any special tools or extensive configuration beyond plug-and-play. They connect to the USB port of the device, providing a straightforward way to restore wireless connectivity without needing to open the computer or replace internal components.

While other options such as Bluetooth adapters may offer connectivity, they are designed primarily for short-range communication and do not facilitate the same wireless networking capabilities as a wireless USB network card. Installing a new motherboard would be an extensive and costly solution, which is generally unnecessary when a simple plug-and-play device can resolve the issue. An ExpressCard wireless network card also serves a similar purpose but is less common and requires an ExpressCard slot, which many modern laptops may not have. Thus, a wireless USB network card is the most practical choice for immediate access to a wireless network.