Do you still have the original PST file in its original location? rename it from .PST to .OLD.
I ahve Outlook 2007, but your proper instructions should be similar:
In Tools... Account Settings, go to the Data Files.
Find the entry for your PST, highlight it, and go to its settings or properties.
In the settings window for the PST, change the path and file name to the appropriate updated path/filename.