You can try a popular Outlook recovery 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 Advanced Outlook Repair - Powerful Outlook recovery tool. PST repair tool.

And you can also download a free demo version at http://www.datanumen.com/aor/aor.exe