NIS icon does not show up in taskbar after being on standby

I recently installed NIS ver. 20.2.0.19 on an XP machine.  NIS works fine until I log out and go on standby.  When i log back on, the NIS icon fails to appear on the taskbar.  If I restart,  it comes back.  I have used the Norton uninstall/install utility twice,  to no avail.  Also have installed this on two other machines,  one XP one Mac/Paralells XP with no problems.