Unusual iTunes problem when restoring iOS firmware(s).

As the topic says, I am having a very strange issue with iTunes and restoring iOS to not only my iPad, but also to my iPod Touch 2nd Gen. So far the only way I have been able to remedy the problem seems to be manually removing iTunes and all API's and/or Frameworks via Terminal; and then re-installing iTunes. For the last several months I have been using iTunes 10.1.1/2 and when I've had to restore my iPad, I have ran into the following problem:
I put my device info DFU Mode to update and here is what happens, it extracts the software as usual and proceeds to restore. It gets nearly to the end of the restore, approximately 97-98% in iTunes, just before the Verifying Restore phase. And it simply hangs there, I have let the device sit for 10+ minutes and does not move. As I said, the only way I can fix it is to completely remove iTunes and re-install. And here is where things get even stranger yet.
A day after I had previously restored, I had to restore again because the iPad AppStore would not open properly on my iPad, and also on the previous day I had uninstalled/re-installed iTunes. And the hanging problem once again occurred, I am not sure why, _*but it seems like every time I restart*_ my MacBook Pro something in iTunes becomes corrupted for some reason and the only way to resolve the issue is a(n) uninstall/reinstall of iTunes.
If anyone has anything to add to help with, it would be much appreciated. Thank you.

From iTunes: Specific update-and-restore error messages and advanced troubleshooting
Error 20, 21, 23, 26, 28, 29, 34, 36, 37, and 40
These errors typically occur when security software interferes with the restore and update process. Use the steps to troubleshoot security software issues to resolve this issue. In rare cases, these errors may be a hardware issue. If the errors persist on another computer, the device may need service.
Also, check your hosts file to verify that it's not blocking iTunes from communicating with the update server. See the steps under the heading "Blocked by configuration (Mac OS X / Windows) > Rebuild network information > Mac OS X > The hosts file may also be blocking the iTunes Store." If you have software used to perform unauthorized modifications to the iOS device, uninstall this software prior to editing the hosts file to prevent that software from automatically modifying the hosts file again on restart.

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