To log on to a network with your PC , the networking feature of Windows XP prompts for an authentication and only a valid guest account login and password are able to access the network in question. The security feature in Windows XP and Vista has to be modified. The local security setting has an option to select the network security and sharing model for local accounts. In the properties section of the local security settings, select the " classic" setting where the local network users may authenticate themselves and carry on with their tasks. This process works fine with Windows XP and Windows Vista but not for other operating systems.