Unexplaied close down message

  Newuser857 16:18 26 Apr 03
Locked

Every time I close down my browser from Outlook Express and some times from Explorer I get the following message

'The instruction at Ox77f5215e referenced memory at Ox007f47fc. The memory could not be written. Check on OK to terminate the programme'.

Can anyone tell me what this means and how to get rid of it. I am running Windows XP.

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