We need to get more details about this situation that you have. After Resetting the Slingbox, are you getting solid lights? (Power and Network). Is the Slingbox connected hardwired to the router?
If the Slingbox is connected hardwired to the router and the computer is connected to the same network and you can get two solid lights but you cannot get the Slingbox detected locally, probably the issue could be with the Anti Virus or a firewall installed on the computer, take a look at this link,
Have you tried to setup the Slingbox using a different PC/Mac?