|You have a couple of options. On one of the computers already connected to the router, try accessing the setup page by opening a browser and typing 192.168.2.1 (this is the default for some Belkin routers but possibly not all of them). If this brings up the Belkin admin page then try using a username of 'admin' and leave the password blank (again this may be different for your router). Then, under the 'wireless/security' section see if the password is displayed in plain text.|
If you cannot access the setup page or you cannot see the password then the next option is to reset the router to its default settings, which will then enable you to access the setup page and set a new password. This is usually done by inserting a thin object into the small button marked 'reset', and holding it for 10-15 seconds.
You haven't provided the actual model of router so it is impossible to give a specific answer, but if you need to know how to do any of the above check the router manual or download it from the Belkin site: http://www.belkin.com/us/support
"I've always been mad, I know I've been mad, like the most of us..." Pink Floyd