Hi,
Sounds like scanpst doesn't work for your corrupt pst file. You can try a tool called Advanced Outlook Repair to repair your PST file. It is a powerful tool to recover messages, folders and other objects from corrupt or damaged Microsoft Outlook PST files.
Detailed information about Advanced Outlook Repair can be found at
http://www.datanumen.com/aor/ And you can also download a free demo version at
http://www.datanumen.com/aor/aor.exe Hope this helps.
Alan