Updating Itunes manually, and it doesn't install

I've tried to manually update Itunes 4 times and each time get the same error:  The installer was stopped before installation was complete.  Your system has not been changed"  The automatic update doesn't work either (something about an invalid signature).  Can anybody help?

Check WIndows System file for corruption:
Go to command prompt (START/ALL PROGRAMS/ACCESSORIES right mouse click "command prompt" and choose "Run as Administrator"
type in
sfc /scannow
let Windows fix any system files that need to be repaired.
Restart the computer if it did actually repair any files.
Now Install and see if it is OK.
If not, fix the Windows Install and Uninstall issue:
Go to Microsoft website to fix install and Unistall 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.
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
Reboot your computer. Next, download iTunes from here:http://www.apple.com/itunes/download/ and install from scratch

Similar Messages

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    HT1925: Removing and Reinstalling iTunes for Windows XP
    HT1923: Removing and reinstalling iTunes for Windows Vista, Windows 7, or Windows 8
    tt2

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