I have two computers networked both on XP professional. I
have a problem whereby certain functions such as opening
files and bringing up a menu when right clicking files in
explorer or on the desktop are much slower when my LAN
connection is enabled. For example If I right click an
Excel file it can take up to 5 secs to bring up a menu,
it should be instant.

This only occurs on one of the computers (which is
virtually new). If I disable the connection the problem
disappears. Any know what might be causing this ?