I recently had to reload Windows XP & MS Office after I had to replace a faulty hard disk. Now, whenever I use Outlook Express I get the message"To free up disk space, Outlook Explorer can compact messages. This may take up to a few minutes". This keeps on reappearing every couple of minutes, even after I've compacted the messages. How do I stop this please?

See this article.
http://email.about.com/od/outlookexpresstroubles/qt/et_compact_oe.htm