It could be a firewall or some security application on the laptop. When you say the other computer works but the laptop doesn't - is the other computer using the same WiFi access point? Don't follow a red herring - for example, if the other computer is using a wired Ethernet connection and the laptop is on WiFi, it could still be a networking issue with the WiFi.

-MegaZone, Sling Media Beta Manager
Slingbox Pro, HD Connect, TiVo Series3, TiVo Pioneer DVR-810H, SPM Treo 680, SP WinXP
(I also run GizmoLovers.com)

If he can connect from outside (the fact that he's using WiFi is irrelevant) at the same time that you cannot connect from machines on the LAN, then the problem is unlikely to be the Slingbox. Since he can connect the Slingbox must be up and working and talking properly. If it is just one PC on the LAN it is more likely to be something on that PC. If none of the machines on the LAN can connect, it is more likely to be an issue with the LAN than the individual machines.

-MegaZone, Sling Media Beta Manager
Slingbox Pro, HD Connect, TiVo Series3, TiVo Pioneer DVR-810H, SPM Treo 680, SP WinXP
(I also run GizmoLovers.com)

That's a logical conclusion - that it has to do with the router switch.

-MegaZone, Sling Media Beta Manager
Slingbox Pro, HD Connect, TiVo Series3, TiVo Pioneer DVR-810H, SPM Treo 680, SP WinXP
(I also run GizmoLovers.com)