@HuanD it's me Abdoe thnx for the hint but I haven't change the Workgroub it still the same since the first times I install the Windows that's mean as the default one "WORKGROUP" 'nd BTW I'm using Windows7 on both PCs, also there's a Feature on Windows 7 which u can see all other PCs from any workgroub while they're connected to the same Router, But I'll try to change them Both to another name just to be sure that this is not the Bug thnx anyway.