It may be a problem with your PST file stored in your profile. Run the PST file integrity check tool, this is located at
c:\program files\common files\system\MSAPI\1033\scanpst.exe
(1033) is the locale ID
Your PST file will by default be located (assuming XP) in
C:\Documents and Settings\profilename\Local Settings\Application Data\Microsoft\Outlook
You may need to enable all files to be made visable
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