Hello good day, I have a LAN with star topology-tree. (Internet dedicated, 1 router, 2 servers, 1 switch, 1 AP, 40 PCs) OS Windows Server SBS 2003 and PCs with Windows 7 and 8. The network cards in the servers are 1GB, Router 1GB, 1GB switch PCs 100MB. Cat5e cabling. But the data transfer is very, very slow. Is the problem with the software on the file server and SQL, or operating system?