You can't remove items in the Notification area by the Rt. click Delete. If
dev's method doesn't work, you may try this: Use the Always Hide option in
the Customize Notification window first. After some time, the unwanted item
will move down to the Past Items panel of this window. Then use the
VBscript provided here to remove it. Any associated programmes removed at
the same time but wanted can be reinstalled. This worked for me.
Line 53 "Remove Past Items from Notification Area"
(Courtesy of MVP Kelly Theriot)
[I have found my Shangri-La in ntlworld.]