Your laptop should have built-in wireless network adapter.For the Windows XP system:
Step 1: Open ” Control Panel ” -> ” Network and Internet ” ->
Step 2: Advanced Setting– Wireless Adapter Setting– Check mark Configure Wireless Adapter Setting with Windows– click OK to confirm
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Download a hotspot software and install it in your laptop.Enable the built-in wireless LAN card and set your laptop to be a hotspot.Then the mobil device can search for hotspot and share the internet.