Tina,
As Rahul mentioned please check the ULS (sharepoint) logs in the 12 hive. If you feel there is no relevant entry in the logs, turn on verbose logging and perform your action and then check the logs.
Go to Central Admin> Operations>Logging and Reporting>Click on Diagnostic Logging and state least critical event to log as verbose.
Regards, Huzefa Mala, MCTS