I have three computers connected to a router. Two wireless (one desktop and one laptop) and another desktop wired. Both desktop comunicates through the router but the laptop gives me an error msg...

"computer name" not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permission.

The network path was not found.

There is no adm. other than me. This is a network in my house with 2 very old computers and about a year old laptop. Any suggestions? Please help!