Windows SharePoint Services 3.0 Portal login

Everything works fine on my SharePoint, but I recently encountered a problem logging into the SharePoint portal via my network server. Everytime I try to log in from the Network Computer, the log in will not except my password. Then if I try to log into another computer with the same login information I am able to login.
Just can’t figure out how permissions would be different on the Server computer compared to any other computer.

thanks for any help.