Either you had a machine of name ‘TINA’ which provided a service (P2P?) to a lot of your hosts or you have a virus/worm looking for its source. Go to any of the hosts generating a lookup request for ‘TINA’ and try to ID the program/service making the request. You can then remove or redirect the program/service. Remember that network printers are also subject to name resolution. If someone had shared a printer in the past, Windows will keep looking for it every time it starts up. In Windows Explorer under the ‘tools’ menu -> folder options on the ‘view’ tab — uncheck the find shared drives and printers to alleviate that problem.