Open the Utilities folder.
Open the NetInfo Manager utility.
Click the lock in the NetInfo Manager window.
Enter an administrator account name and password, then click OK.
If you have not previously set a root password, an alert box may appear that says "NetInfo Error," indicating that the password is blank. Click OK.
Enter the root password you wish to use and click Set.
Enter the password again for verification and click Verify.
The root user is now enabled.
Click the lock again to prevent changes.
Then log out of your account and then in as root and try deleting the stuff...after you're finished, go into NetInfo Manager and cancel the root user