Errors occurred while installing the updates. If the problem persists,

Hi,
My iPod Touch 4th generation has the update version 4.2.1 (latest is 5.something) and needs nearly a half GB update. Every time I try to update iTunes (uninstalled and reinstalled last two) or my iPod. I get the error in the heading or ""iTunes" has an invalid signature. the download has been removed."
I have done all the following as stated in the Apple help
1. Empty your Temp directory and restart
2. Completely remove iTunes and related components
3. Install the latest version of iTunes
1. Make sure you have administrator account access
2. Make sure your folder names don't contain strange characters
3. Get the latest Windows updates
4. Disable other conflicting software
I have even gone in and selected, though I don't remember where "Allow downloads with invalid signature" (to that effect)
I just read that it might be a router problem so I bypassed my families wireless router and plugged in a hard line. Didn’t work. If no advice comes from here, I will try again on the school network next Tuesday…
Advice? Thoughts? Ideas?
Alex

Apple digitally signs its software updates to ensure the authenticity of update packages.  When you receive an "Invalid Signature", that means the software package may not be legitimate.  But then of course, many a times, it's a false alarm from other problem.
I would suggest you to Uninstall everything and reinstall from scratch but follow the following steps:
1. Go to Microsoft website to fix install and Uninstall problems. Click "Run now" from Fix it to remove all iTunes & related installer files.
http://support.microsoft.com/mats/Program_Install_and_Uninstall
Be aware that Windows Installer CleanUp Utility will not remove the actual program from your computer. However, it will remove the installation files so that you can start the installation, upgrade, or uninstall over.
2. You should remove all instances of iTunes and the rest of the components listed below:
it may be necessary to remove all traces of iTunes, QuickTime, and related software components from your computer before reinstalling iTunes.
Use the Control Panel to uninstall iTunes and related software components in the following order:
iTunes
QuickTime
Apple Software Update
Apple Mobile Device Support
Bonjour
Apple Application Support (iTunes 9 or later)
Follow the instructions from Apple article listed here: http://support.apple.com/kb/HT1923 to remove all components
3. Reboot your computer. Next, download iTunes from here:http://www.apple.com/itunes/download/ and install from scratch

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