What security is set up on the borrows laptop. Is it set to the same network name. The error code is shown on a google that a dll file can not be loaded so I would guess the it is probably one to do with the troubleshooter. (Google it yourself for more info).
Does the router SSD show if you click on the network icon in the taskbar bottom right. Does it show a reasonable signal strength. If so select and click on Connect and enter the security key and the correct type of security set on the router (WEP, WPA etc)If it does not connect then we will take it from there.
Is the firewall blocking it. Switch it off and see if you can connect.