update MS Messenger problem ...

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Hi folks ... I think I am really stuck here.

Running XP Pro/Office Pro 2002 and installed Norton Internet Security 2005.

When I start Windows I now get a Messenger (I have never used Messenger)
download program update demand which denies computer usability if I deny.
This download update then initiates and then after some minutes subsequently
fails and proceeds to redirect me until I can close down and proceed.

Symantec give me the usual auto-blab that the problem lies with my OS.

Short of unstalling NIS2005 and losing my subscription is there any way I
can disable/delete Messenger???

Thanks in advance ...
.