ITunes update 10.5.3 not loading on windows 7

I have tried numerous times to download  and install the update itunes 10.5.3 and consistently receive the error message that the itunes signature is invalid.
I have run system scans and done various maintenance on my computer, but nothing seems to help.
Suggestions?

I got it to work now ...
-Unistall the current iTunes on your computer.
- go to http://support.apple.com/kb/DL1427
-Go all the way down the page and download the iTunes through the given link
----------Download for iTunes 10.4.1 for Windows  (64 - bit) here:  iTunes 10.4.1 for Windows 64-bit.
-Once downloaded if a message window pops up with a message "the file itunes library.itl cannot be read"
Just go to My documents-> Music folder -> iTunes folder -> delete library.itl if existing or add it if it doesn't exist.
it worked for me so I believe that it should
Good luck

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