My apps aren't authorized and when i double click them to authorize, enter the correct password with the account i bought them with, it says error -42408 try again later. HELP?!?!?!?!?!!

Hi
You may find the following works:-

Turning off 2-Step Verification

1. Visit the Using 2-Step Verification page under your Google Account settings. Sign in with your username, password, and verification code if prompted.
2. Click Turn off 2-Step Verification.
3. A pop-up window will appear to confirm that you want to turn off 2-Step Verification. Click OK.

Revoking and destroying passwords and codes to protect your account

If you used App Passwords to authorize applications to access your Google Account, we recommend you go back to using passwords -- rather than App Passwords -- to access these applications. That way, you can revoke your App Passwords so nobody else can use them:

1. Visit the Authorizing applications & sites page under your Google Account settings.
2. Click Revoke for any application or device whose code you want to revoke.
3. For each application that you revoked an App Password, you'll need to reauthorize the application by entering your username and password, as you did before you turned on 2-Step Verification. You might not be prompted for this information the next time you use the application as some applications will take longer to recognized that an App Password has been revoked.

In addition, remember to destroy all backup codes that you had been using to verify this account.

Good luck.

Click "Start," then select "Run." In the text box displayed, enter "control userpasswords2" and press "Enter." This opens a configuration window.
Click the user for whom you want to disable the password login.
After selecting the user, remove the check mark labeled "Users must enter a username and password to use this computer."

Click "Apply."
A dialog box will prompt you for the password.
Enter the user's password to authorize the changes and press "OK."
Reboot your Windows XP computer. When it shows the list of user profiles, click the user whose password was disabled.
You should be able to log in without a password.
also
Click the "Start" button.
Double-click "User Accounts."
Select the user account you wish to change.
Select "Change My Password." If you wish to remove the password, select "Remove My Password."
also
Click start control panel Open User Accounts in Control Panel. On the Users tab, click the name of the user whose password you want to change, and then click Reset Password.
Just click In New password and Confirm new password, type the new password by just clicking, and then click OK. Notes You can change passwords only for local computer accounts, such as guest, administrator, or accounts you create for your computer.
You cannot change your network logon password in User Accounts.
To change your own password, press CTRL ALT DELETE and then click Change Password

Click "Start," then select "Run." In the text box displayed, enter "control userpasswords2" and press "Enter." This opens a configuration window.
Click the user for whom you want to disable the password login.
After selecting the user, remove the check mark labeled "Users must enter a username and password to use this computer."

Click "Apply."
A dialog box will prompt you for the password.
Enter the user's password to authorize the changes and press "OK."
Reboot your Windows XP computer. When it shows the list of user profiles, click the user whose password was disabled.
You should be able to log in without a password.
also
Click the "Start" button.
Double-click "User Accounts."
Select the user account you wish to change.
Select "Change My Password." If you wish to remove the password, select "Remove My Password."
also
Click start control panel Open User Accounts in Control Panel. On the Users tab, click the name of the user whose password you want to change, and then click Reset Password.
Just click In New password and Confirm new password, type the new password by just clicking, and then click OK. Notes You can change passwords only for local computer accounts, such as guest, administrator, or accounts you create for your computer.
You cannot change your network logon password in User Accounts.
To change your own password, press CTRL ALT DELETE and then click Change Password

If the computer doesnt work at all, and you are up to the 5 limit for authorizations you can reset them all at once, this will de-authorize ALL of your computers and you will have to re-authorize the ones you want. If you have NOT reached your 5 limit you have to contact Apple to have the de-authorize a machine. (De-authorizing all machines can only be done once per year).

To use the first method (de-authorize all) do the following :

1. Click iTunes Store in the menu on the left side of iTunes.
2. If you're not signed in to the store, click the Account button, then enter your account name and password.
3. Click the Account button again (your ID appears on the button), enter your password, and then click View Account.
4. In the Account Information window, click Deauthorize All.

IF your computer still turns on, you can de-authorize just that computer by doing the following:

1. Open iTunes.
2. Choose Store > Deauthorize Computer (In earlier versions of iTunes, access this option from the Advanced menu).
3. Select "Deauthorize Computer for Apple Account" and enter your Apple ID and password

You need to authorize iTunes in order for it to proceed with the update. Do that going to Store> Authorize this Computer...
You will then be asked for your log in information (Apple ID and password). Click Authorize after providing the necessary info.
There's another way. Go to iTunes Store which you'll find at the sidebar. And on the top-right corner, you will see "Sign In", just below the search bar.
Sign in there.
Note, the account you used to purchase those apps should be the account that will use to Sign In or Authorize in iTunes on your PC.

You need to authorize and deauthorize the computers appropriately for using the different ipods on different machines.
Read this article from apple web site.

Deauthorizing a computer allows you to manage which computers can play music, videos, audiobooks, or other content purchased from the iTunes Store.
Authorization helps protect the copyrights on the content you buy. You can use your digital rights management (DRM)-protected music purchases1 from the iTunes Store on up to five different computers (these can be any mix of Macintosh or Windows-compatible computers). When you play an item you've purchased, your computer is "authorized" to play content purchased using your Apple Account.
Note: Songs you encode in AAC format from a source other than the iTunes Store, such as your own audio CDs, and songs from iTunes Plus downloads do not need to be authorized.
Products Affected iTunes Store
To authorize a computer to play purchases using your Apple Account

1. Select a song, video, or audiobook you've purchased (in your library or the Purchased playlist).
2. Click the Play button.

If the computer is already authorized, the item plays. If the computer has not yet been authorized, iTunes asks you to enter the Apple ID and password you used to purchase the song.
Remember to deauthorize your computer before you sell it, give it away, or get your computer serviced.
To deauthorize a computer

1. Open iTunes.
2. Choose Store > Deauthorize Computer (In earlier versions of iTunes, access this option from the Advanced menu).
3. Select "Deauthorize Computer for Apple Account" and enter your Apple ID and password.

Make sure you deauthorize your computer before you upgrade your RAM, hard disk or other system components, or reinstall Windows. If you do not deauthorize your computer before you upgrade these components, one computer may use multiple authorizations.
To deauthorize all computers associated with your account If you find you have reached 5 authorizations, you can reset your authorization count by clicking Deauthorize All in the Account Information screen.

1. Click iTunes Store in the menu on the left side of iTunes.
2. If you're not signed in to the store, click the Account button, then enter your account name and password.
3. Click the Account button again (your ID appears on the button), enter your password, and then click View Account.
4. In the Account Information window, click Deauthorize All.

Note: You may only use this feature once per year. The Deauthorize All button will not appear if you have fewer than 5 authorized computers, or if you have used this option within the last 12 months. If you need assistance on using this feature, please contact the iTunes Store support via email (http://www.apple.com/support/itunes/ww/).

Additional Information

• iTunes DRM-protected music includes audio with a bit rate of 128 kbps and allows users to transfer songs and videos to up to five computers, burn seven copies of the same playlist to CD, and sync to an unlimited number of iPods.
• iTunes Plus music refers to songs and music videos available in our highest-quality 256 kbps AAC encoding (twice the current bit rate of 128 kbps), and without digital rights management (DRM). There are no burn limits and iTunes Plus music will play on all iPods, Mac or Windows computers, Apple TVs, and many other digital music players.
• While you may need to enter your account information again after initializing or formatting your hard disk, initializing or formatting the hard disk itself does not remove the computer from the list of authorized computers. If you plan to initialize or format your hard disk prior to selling or donating your computer, deauthorize the computer first, then initialize or format the hard disk.
• Under some circumstances you may be required to enter your registration information again, but this should not use up multiple authorizations. If you think that you may have used up multiple authorizations on just one computer, see One computer using multiple iTunes Store authorizations.
• The iTunes Store is governed by its Terms of Service, which permits Apple to change the authorization policy.
• You can authorize computers not located in the United States so you can play previously purchased music.
• An Apple ID based on an expired .Mac (pronounced "dot Mac") or Mobile Me account name and password can still be used to purchase items and to authorize or deauthorize computers to play purchased music.

See the following documents for additional information:
HT1373: "iTunes: How to Copy Music Between Authorized Computers"
HT1727: "iTunes for Windows: How to Copy Music Between Authorized Computers"
HT2204: "iTunes: About Apple ID and Password"

Hi,

To deauthorize all computers associated with your account
1. Click iTunes Store in the Source pane.
2. If you're not signed in to the store, click the Account button, then enter your account name and password.
3. Click the Account button again (your ID appears on the button), enter your password, and then click View Account.
4. In the Account Information window, click Deauthorize All.

To authorize a computer to play purchases using your Apple Account
1. Select a song, video, or audiobook you've purchased (in your library or the Purchased playlist).
2. Click the Play button.

If the computer is already authorized, the item plays. If the computer has not yet been authorized, iTunes asks you to enter the Apple ID and password you used to purchase the song.

Please let us know if that was helpful enough.
Good Luck & Thanks,
Shiv.

try backing up your WHOLE iTUNES FOLDER onto any kind of external drive. and try re-installing itunes.

did you ever get a fix?