some more Microsoft info links-
#1
http://www.microsoft.com/windows/ie/.../oerepair.mspx
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#2
SUMMARY
This article describes how to reinstall or to repair Internet Explorer in Windows XP. You may have to do this if you have problems with Internet Explorer because of damaged files or missing registration information.

Note In some cases, the steps to reinstall or to repair Internet Explorer 6 will also resolve problems in Microsoft Outlook Express.

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Introduction
You may have to reinstall or to repair Internet Explorer in Windows XP if you have problems with Internet Explorer because of damaged files or missing registration information. You may also decide to reinstall or to repair Internet Explorer 6 to resolve problems with Outlook Express in Windows XP.
http://support.microsoft.com/default...23120121120120
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#3
[from a forum- Thanks, this is what I did which I think ended up fixing the problem:
After going into the folder options and file tab, I couldn't find "EML Outlook Express Mail Message". Instead, I found "EML Email File". I then clicked on 'restore' and it reverted to "EML Outlook Express Mail Message". Now, everything works perfectly again, thanks!]