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this have happened to me, try restarting you computer with the ipod plugged in if that doesnt make the trick reinstalling itunes always does
the computer you are trying to sync it to may have a different version of itunes than you have. for example the newer ipods wont sync to aything but the newest version of itunes that was out when it was released or any new version that have been released since.
because it doesn't like you
Connect it to a computer running iTunes. You will always be backed up when you sync. Unlike iCloud, there is no size limits for the backups, either.
They will only on your home computer. Your home computer is that ONE computer that you got all of your music/videos off of. (or the first computer you sync-ed your ipod/iphone with. Then you click on your ipod/iphone and sync the apps on the 'applications' tab on the top. It might ask you to put in your itunes email and password (otherwise known as 'apple ID) Dont worry. Just put in your info. Its just asking you permission to download all of the apps you PAID for.
You can sync to your ipod with Windows Media Player. This app costs $, but it does work. http://www.mgtek.com/dopisp/
it means whatever is in your itunes would be synced to your ipod. so sometimes you have songs in your ipod that is not on itunes. and when you sync it with itunes, it wipes out whatever is in your ipod. yes. but check out xilisoft ipod rip. it syncs both ways and wont wipe anything. http://www.xilisoft.com/ipod-rip.html
You might need to install a new version of Apple software in your iTouch.
MY GUESS WOULD BE TO DOWNLOAD A DIFFERNT VERISON OF THOSE SONGS.
restart. it is as simple as that. for some reason, xp can't see any USB connected storage drive (including iPod sometimes, especially if it has been in stand by mode
the computer you are trying to sync it to may have a different version of itunes than you have. for example the newer ipods wont sync to aything but the newest version of itunes that was out when it was released or any new version that have been released since.
Unplug you usb cord from your ipod and then plug the usb cord back it! "Voila Magic"