We need the complete text of the error message. See if any of the info here
helps:
http://www.google.com/search?hl=en&q=an+error+has+occured+site%3Amicrosoft.com

Signature
Jim Pickering, MVP, Outlook Express
https://mvp.support.microsoft.com/profile=F9F51EF1-4AE3-4D23-B2D8-1171988A62D6
Please deliver feedback to the newsgroup, so that others can be helped.
Thanks.
> I'm a new user of windows 2000, and have been unable to open any email
> messages, or reply or forward them. A window appears when I click on a
[quoted text clipped - 4 lines]
> are
> correct.
ledafalsia@yahoo.com.ar - 30 Aug 2005 16:01 GMT
thanks to you, for everythings.