Hello! My name isXXXXX will work diligently to provide accurate advice and information.
On your PC, you can download previously purchased content as follows:
Make sure you have downloaded and installed the latest version of iTunes before attempting this:http://www.apple.com/itunes/download/
Now, open iTunes
Click the "Store" option in the menubar and choose "Authorize this Computer..." and supply the Apple ID and password XXXXX used to purchase/download the lost music and apps.
*Note: If running iTunes 11 on Windows, you may need to show the menubar
Next, select the iTunes Store. Sign in with the same Apple ID and Password, if you are not already.
In the iTunes Store, you should see a Quick Links sidebar at the right side of the page. Look for the "Purchased" option and click it.
On the Purchased page, you will see a toggle near the top-right of the page labeled as "All | Not In My Library". Select "Not In My Library".
Under Music, select "All Songs" from the listing at the left and then click "Download All" in the bottom right.
Repeat the above for "TV Shows", "Apps", and "Books"; making the appropriate choices as applicable.
When the downloads are complete, plug in your iPod.
Select it when it appears in the iTunes sidebar.
You should see a new menubar appear above the Summary page for the device. Go through each option and make sure the appropriate options are selected for syncing. If you need assistance on what to choose on each page, just let me know and I will walk you through each one, as needed.
On the iPod itself you can also fine previously purchased content directly on the device by clicking the iTunes Store icon, choosing "More" at the bottom of the screen and then selecting "Purchased".If you continue to have questions on this topic, just reply back to this discussion. I will be more than happy to work with you further. Hopefully, this info will answer your question
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Thanks and good luck,