LaurieA, Let just get it all out in the open for all versions of Windows. The is quoted from the Direct Advertiser's site.... How to set up your system not to receive netbios messages To disable the ability for anyone in the world to send netbios messages to your computer, you can disable the Messenger service. Its easy to reverse if you wish to later. Should you have any difficulties disabling the Messenger service please email us and we'll help you out. If you do not wish to disable File and Printer Sharing you may install a firewall and block the incoming traffic on port 135 UDP. To deliver the message our program uses a NetBios call built into the Windows API. We are aware that there are several knock-offs of our software out there that send on UDP port 137 and TCP 139, so you may want to block those also. Windows 2000 Click Start->Setings -> Control Panel->Administrative Tools->Services Scroll down and highlight "Messenger" Right-click the highlighted line and choose Properties. Click the STOP button. Select Disable or Manual in the Startup Type scroll bar Click OK Windows XP Click Start->Control Panel Click Performance and Maintenance Click Administrative Tools Double click Services Scroll down and highlight "Messenger" Right-click the highlighted line and choose Properties. Click the STOP button. Select Disable or Manual in the Startup Type scroll bar Click OK Windows 98/ME Remove or disable the file and printer sharing from your network configuration. Disabling File & Printer Sharing on a Single Computer If you are only using a single computer (not using a LAN), File & Printer Sharing should be disabled to reduce any potential security risks on your PC. Please use the following instructions to disable File & Printer Sharing: On the desktop, double-click on My Computer. Double-click on Control Panel. Double-click on Network. From the Configuration tab, click on the File & Print Sharing button. Turn off file sharing and print sharing by clicking each box to remove the check marks. Click on the OK button. Select the TCP/IP protocol that is pointing to your Ethernet card or USB cable modem. Click on the Properties button and click on the Bindings tab. Click to uncheck the boxes next to "Client for Microsoft Networks" and "File and printer sharing for Microsoft Networks". NOTE: If there is more than one listing of TCP/IP, steps 7-9 should be repeated. Click the OK button twice and restart your computer. Enabling File & Printer Sharing on a Local Area Network If you wish to share files on a Local Area Network (LAN), you should use File & Printer Sharing with NetBEUI. NetBEUI is a safe, non-routable protocol that can be used on a LAN to share files and printers. Ensure that TCP/IP is not bound to File & Printer Sharing as shown in the previous section. On the desktop, double-click on My Computer. Double-click on Control Panel. Double-click on Network. Click on the Add button. Select Protocol, then click the Add button. Under Manufacturers, click on Microsoft and then double-click NetBEUI. Click on the OK button to restart your computer.