This might be a permission issue.
What I do to fix issues such as these is the following:
1. Insert your Tiger OS X install disc 1
2. Shut down your system
3. Turn it on while pressing the "c" key
4. A blue screen will appear with language options, choose your language option
5. (I have a German version so not sure what the titles on the top menu say in English) select disk utilities or service applications, whatever it says there
6. Select disk utility and select the volume you want to repair in the menu on the left
7. Now you will see a few options there. Click the "repair disk" or permissions (again, not sure what the exact phrasing is in the English version) and if there are any wrong permissions set, those will be corrected
8. After the procedure is done, close that window and choose your startup volume to restart your computer.