ITunes update always fails on Windows 7 x64

I have had this problem for over a year on my Windows 7 64-bit system.  Whenever there is a new version of iTunes, I try and update using the iTunes Software Update notification that pops up.  This always fails to install.  I am then forced to uninstall it fully and re-install using the directions located here:
http://support.apple.com/kb/ht1923
The above works but is a major hassle.  I don't understand why this keeps happening and have looked for solutions here and elsewhere.  Any help would be appreciated.
Thanks!

I have had this problem on my x64 Win7 machine for as long as I can remember.  I may however have found a solution.  I recently added another User Account (non-admin) to my machine so my wife could use it too.  Whilst logged in her account today iTunes popped up with an update.  I had tried this update (10.6.3.25) on my windows account a couple of times with it failing each time.  I had decided I could no longer be bothered going through the full uninstall/reinstall process again and wasn't going to bother. 
For some reason though I thought I'd give it a go on my wife's windows login. It worked just fine.......
So my suggestion is to create another Windows User Account and see if you can update iTunes from that account instead.  It's the first time in at least 18 months that iTunes update has worked properly.

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    --- many, many more lines of "Deferred path ... is not in sandbot and will be skipped ---
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    Nov 12 11:13:26 Bruces-MacBook-Air Software Update[1060]: Error: An error occurred while setting up files for deferred installation. (PKInstallErrorDomain code 114)

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