Try reseting the online settings on the PS3 whilst the laptop is connected to the router. Then re-configure the PS3, whilst the laptop is connected. That way the PS3 should connect with a different IP address.
The IP addresses should be 192.168.0.1 (router)
192.168.0.2, and 192.168.0.3 either laptop or PS3.
If not you can configure the PC to a different IP address of your choosing
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