access privileges issue

Back up all data now. Before proceeding, you must be sure you can restore your data to its present state

Step 1

Launch the Terminal application in any of the following ways:

☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)

☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.

☞ Open LaunchPad. Click Utilities, then Terminal in the page that opens.

Drag or copy — do not type — the following line into the Terminal window, then press return:

chmod -R -N ~

The command will take a noticeable amount of time to run. When a new line ending in a dollar sign ($) appears below what you entered, it’s done. You may see a few error messages about an “invalid argument” while the command is running. You can ignore those. If you get an error message with the words “Permission denied,” enter this:

sudo !!

You'll be prompted for your login password, which won't be displayed when you type it. You may get a one-time warning not to screw up.

Step 2

Boot into Recovery by holding down the key combination command-R at startup. Release the keys when you see a gray screen with a spinning dial.

When the OS X Utilities screen appears, select Utilities ▹ Terminal from the menu bar. A text window opens.

In the Terminal window, type this:

resetpassword

That's one word with no spaces. Then press return. A Reset Password window opens. You’re not going to reset a password.

Select your boot volume if not already selected.

Select your username from the menu labeled Select the user account if not already selected.

Under Reset Home Directory Permissions and ACLs, click the Reset button.

Select  ▹ Restart from the menu bar.

I found a reference to that phrase "you dont have write access for your itunes media folder or a folder within it. to change permissions" which concerns commerce at the itunes store.

Have a look at this link to see if you have a Sharing folder existing.

google this link

http://support.apple.com/kb/ts1277

In the link you will need to click on the triangles to reveal the instructions if you need to follow them.

Here is a copy and paste of it.

iTunes: Missing folder or incorrect permissions may prevent authorization

Symptoms

With Mac OS X, the Shared folder is required to authorize your iTunes Store purchases. With Windows the iTunes folder is also required. If either of these folders are missing or have incorrect folder permissions, you may notice one of the following symptoms:

• You are unable to complete a purchase from the iTunes Store.
• You cannot play content you purchased from the iTunes Store.
• An alert appears with the following text:

  "There was an error storing your authorization information on this computer. The required directory was not found or has a permission error."

Resolution

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Mac OS X

1. Log in to your computer using an administrator account.
2. In the Finder, choose Go to Folder from the Go menu.
3. Type: "/Users" (without quotes) and click Go.

If the Shared folder exists

1. Open Terminal (found in /Applications/Utilities).

   Warning: This step involves modifying permission settings by entering commands in the Terminal application. Users unfamiliar with Terminal and UNIX-like environments should proceed with caution. The entry of incorrect commands may result in data loss or unusable system software. Improper alteration of permissions can result in reduced system security or exposure of private data. This option requires a non-blank admin password.

2. Depending on which version of Mac OS X you have, this step will vary:
   • On Mac OS X v10.5.8 and earlier, type: sudo chmod -R 777 /Users/Shared
   • On Mac OS X v10.6 or later, type: sudo chmod -R 1777 /Users/Shared
3. Press Return.
4. Quit Terminal.

If the Shared folder does not exist

The following steps will recreate the Shared folder if it is missing and ensure that it has been assigned using the correct permissions.

1. Open Terminal (found in /Applications/Utilities).

   Warning: This step involves modifying permission settings by entering commands in the Terminal application. Users unfamiliar with Terminal and UNIX-like environments should proceed with caution. The entry of incorrect commands may result in data loss or unusable system software. Improper alteration of permissions can result in reduced system security or exposure of private data. This option requires a non-blank admin password.

2. Type or copy and paste the following command into the Terminal window: sudo mkdir -p /Users/Shared/
3. Press Return.
4. Enter your administrator account password when prompted, then press Return.
5. Depending on which version of Mac OS X you have, this step will vary:
   • On Mac OS X v10.5.8 and earlier, type: sudo chmod 777 /Users/Shared
   • On Mac OS X v10.6 or later, type: sudo chmod 1777 /Users/Shared
6. Press Return.
7. Quit Terminal.

Message was edited by: roam

check back to the topic, I pasted the article because the link did not work.