Trying to download iOS 5 it says there is a problem with my Windows Installer Package?Help?

I'm trying to download the iOS 5 and I get almost all the way done but then it stops when it's on Status and goes to an error and says "There is a problem with this windows Installer Package.  A program run as part of the set up did not finish as expected.  Contact your support personnel or package vendor."  I have a windows vista computer.. but it should be able to run on it...
Any ideas on how to fix this??
Thanks!!

'NOsaint09' - I was getting your same error message trying to install the iTunes 10.5 update on my Windows XP machine (in order to install iOS 5 on my iPhone 4). Tried uninstalling and reinstalling iTunes several times to no avail - same message, no install.
Well, after reading the above post by 'wiss...' i went to start Apple Software Update and was getting another (very cryptic) error message just trying to start ASU. I thought perhaps the problem with this program was causing iTunes 10.5 not to install - so I went to uninstall Apple Software Update using Windows Add/Remove Programs, and got another error message (not allowing the uninstall)!
Knowing there are programs out there just for the purpose of doing a forced & thorough uninstall, I search Cnet Downloads for the best free Uninstaller and downloaded Revo Uninstaller. Used Revo to uninstall Apple Software Update (and all associated files/data it found in registry).
Then to be sure, ran Disk Cleanup in windows to empty the Temp files/folders and Restarted the computer.
Finally, I ran the iTunes Setup.exe for 10.5 and it installed successfully!!  Woohoo! I hope my experience may help others with similar troubles!
And thanks to Wiss for directing me to the problematic ASU program!

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