This sounds very much like the action of Windows when you have left the IP address for Windows to obtain automatically. Check that you've assigned a specific IP address to each PC. To do this go to Network Connections, Properties, select the Internet Protocol (TCP/IP) and its properties, and choose the "Use the following IP address" section. Allocate something like 192.168.0.N (where N is up to you, a unique value for each PC) and a mask of 255.255.255.0.
Pete,
Thanks very much - this was the problem. One Computer had an assigned address, the other was automatic and putting both to assigned solved the stutter cycle.
However!!! - it introduced another problem. With the previous auto setting my second computer could access the Dial-up Internet connection on the First computer. Switching to assigned numbers in TCP/IPC takes this away. It disappears from network connections on the second machine and running a programme that requires internet access.g Internet explorer or FSmeteo on the second machine no longer starts up the dialup on number 1. Even starting the dial up on number 1 doesn't seem to allow No 2 to useit. Is there a way to get this facility back that you are aware of?
Thanks very much for your help
Keith Cocker