New
#21
No longer think it's a modem thing if a third PC worked. Updating the driver is a good idea.
Check this, connect your laptop via wireless and the problem computer by ethernet then open the status for both adaptors and click details. Check that the IPv4 Subnet Mask, Default Gateway and DNS server are the same for both computers and only the last number of the IP is different. Please confirm this.
Next disconnect the ethernet and make sure you have internet working on the laptop then check the laptop's status again and see if anything has changed.