Resetting networking in XP
I had a machine with slow response in Remote Desktop. I found this article, but the primary solution was regarding Windows Vista/7 automatic configuration.
However, in the comments I found the following sequence, which does seem to reset troubled adapters even on XP:
netsh winsock reset
netsh int ip reset
netsh interface ip delete arpcache
netsh winsock reset catalog
netsh int ip reset reset.log