Apps not recognized by iTunes

Hello -
I would appreciate any suggestions regarding an apparent issue with my iPod touch 2G. This is in conjunction with iTunes 8.0.1 on a G5 tower, dual core 2.0.
The iPod will download and run apps from the Apps Store without difficulty, and iTunes will download apps, as well. However, iTunes is unable to install apps to the touch -- this generates an error message indicating that the attempted install failed due to "an unknown error (-4)." Likewise, apps on the touch are not backed up to iTunes; there is no "applications" folder associated with the touch as a device under iTunes. I've tried deleting the apps from the touch (after acknowledging a warning message that the apps have not been backed up), deleting them from iTunes and re-downloading, deleting the touch backup in iTunes and forcing a new backup, etc. In essence, it appears that iTunes is unaware that there are apps on the touch, and it's likewise unable to install apps to the device. Apps are set to "sync" in iTunes. I've done everything but restore the touch, which I'm reluctant to do because at this point I'm unsure whether I have an accurate backup, or not (given this behavior).
Any suggestions appreciated --
Edward

Try some basic troubleshooting before you restore your iPad.
First close all apps. In order to close apps, you have to drag the app up from the multitasking display. Double tap the home button and you will see apps lined up going left to right across the screen. Swipe to get to the app that you want to close and then swipe "up" on the app preview thumbnail to close it.
Next, reset the iPad by holding down on the sleep and home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider if it appears on the screen - let go of the buttons. Let the iPad start up.
If that didn't help, try this. Reset all settings. You will not lose any data, but most of the device settings will have to be entered in the settings app again. Settings>General>Reset>Reset all Settings.
IF you really feel that you need to restore, and maybe you will have to, try this for help with the device not being seen by iTunes.
iPhone, iPad, or iPod touch not recognized in iTunes for Windows - Apple Support

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My ipad is not recognized in iTunes, when plugged into my computer. I can't back up or sync to my computer, but I have managed to back up to icloud, I think. Applications shut off within 20 seconds of opening them on my ipad. I think I need to reset my ipad but I'm just not getting that option when I plug it in to my computer and I'm worried about whether or not the icloud backup is sufficient. Thanks!

Try some basic troubleshooting before you restore your iPad.
First close all apps. In order to close apps, you have to drag the app up from the multitasking display. Double tap the home button and you will see apps lined up going left to right across the screen. Swipe to get to the app that you want to close and then swipe "up" on the app preview thumbnail to close it.
Next, reset the iPad by holding down on the sleep and home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider if it appears on the screen - let go of the buttons. Let the iPad start up.
If that didn't help, try this. Reset all settings. You will not lose any data, but most of the device settings will have to be entered in the settings app again. Settings>General>Reset>Reset all Settings.
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iPhone, iPad, or iPod touch not recognized in iTunes for Windows - Apple Support

IPad 2 not recognized on iTunes

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Hi there Matthew,
It sounds like your iPad is in recovery mode and it isn’t recognized by iTunes, also this all started after attempting to update iTunes on your PC and iOS on the iPad. Take a look at the article linked below and try the troubleshooting suggestions that it provides before attempting to restore the iPad.
iPhone, iPad, or iPod not recognized in iTunes for Windows - Apple Support
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Removing and reinstalling iTunes and other software components for Windows Vista, Windows 7, or Windows 8
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iOS: Device not recognized in iTunes for Windows
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Rather than create another "iPhone not recognized by iTunes" thread, I'll add to this one. I have an iPhone 3G 8GB.
After going through those steps you listed, my Windows XP installation always reverts back to the old Windows Apple iPhone drivers which only sees it as a camera. I've had it set to only pull from the iTunes drivers by specifying "Don't search, I will choose the driver to install" in the Hardware Update Wizard. Windows still doesn't like the iTunes drivers stating "the specified location does not contain information about your hardware". This location is the same as you noted: "C:\Program Files\Common Files\Apple\Mobile Device Support\Drivers" which contains:
usbaapl.cat
usbaapl.inf
usbaapl.sys
All dated 7/22/2008.
My current drivers for the iPhone in my setup are still the MS drivers, version 5.1.2600.0.
usbscan.sys
ptpusb.dll
ptpusd.dll
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Message was edited by: Cassiux
Message was edited by: Cassiux

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http://www.apple.com/support/ipad/assistant/itunes/
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http://support.apple.com/kb/TS1591
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http://support.apple.com/kb/TS1538
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http://support.apple.com/kb/HT4235
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http://support.apple.com/kb/HT1386
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http://www.apple.com/support/ipad/syncing/
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http://support.apple.com/kb/ts4062
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How To Completely Uninstall and Remove All Traces of iTunes
http://zardozz.com/zz/2008/04/how-to-completely-uninstall-and-remove-all-traces- of-itunes.html/
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