This error usually occurs if the OST or PST file you are using is:
- Protected with file permissions.
- On a share on a server and the network is down.
To correct this problem, store the OST or PST file on the local computer.
You may also want to run the scanost.exe and scanpst.exe tools to verify file integrity.
C:\Program Files\Microsoft Office\Office12\SCANPST.exe