Yes, there is a way to get them back. As long as you are using the same iTunes account, you can get all of your apps back for free. If you remember all of the apps you need back, just download all of them again through iTunes, and since you already downloaded them once (if they're not in your computer's system), it will download them for free.
No. It should allow you to redownload what you have paid for on an authorized computer.
No, this simply retards your iTunes on that computer from Home Sharing, and other similar features.
itunes will back up your apps when you sync your iPhone if the computer is authorized (store-authorize computer in itunes).
Yes your songs will be deleted but you can get them off the iPod using a program such as iDump or iPod2Computer Transfer Curtis White
download itunes go into the music store and sign in using the email and password from when you registered
You can have a max of 5 authorized computers. all this means is that iTunes only lets you buy and listen to your music on one of these 5 (or less) computers. If you deauthorize it, you will no longer be able to do this, but it frees up another computer to be authorized. to reauthourize it, go to Store-Authoize computer. Enter your accont name and password and your computer will be authorized again.
Only if the apps were synced to the computer before being deleted from the device before you synced it. Otherwise, no
You can't once it's gone, its gone.
First, one has to move his or her iTunes files onto another PC by emailing them, putting them on a USB stick, or putting them on a portable hard drive. Once the files are on another computer one will need to authorize that computer with the iTunes store account that purchased the original songs. Also, it would be wise to deauthorize the old computer because each account only has a limited number of allowed authorized computers. With the new computer authorized simply import the files and they can be played on the new PC.Alternative solution to transfer iTunes to a new PC using free Tuneswift:http://transfer-itunes-to-new-pc.blogspot.com/
Sadly, iTunes files cannot be transferred from computer to computer or onto a USB flash drive. The reason why is the files are "locked". This means that the files cannot be opened on any other computer that isn't authorized by the iTunes account holder.
You only need to download itunes again is if you deleted it, got a new computer, or are needing to upgrade it to the new 10.01.0
I had this happen to me once. I put it on my computer, deleted all of the files... It was not pretty...CONTACT ITUNES! DO NOT DO WHAT I DID!