Tried to download iTunes 9 computer restarted itself did not continue

Question

While trying to download iTunes 9 my computer froze and restarted itself. When I turned it back on it did not finish downloading and the iTunes i already had would not open up. When i tried to download iTunes 9 again it said "enter an alternate path to a folder containing the instillation package 'iTunes.msi' in the box below". When i tried entering another path it said it could not be found and to "Verify that you have access to this location and try again or try to find the instillation package 'iTunes.msi' in a folder in which you can install the product iTunes.'
What do i do?

Answer 1

HRESULT: 0x8007054f.
... that seems to have been the most popular alphanumeric code in recent days. (Just like katherine's one.)
In general, these ones tend to be caused by underlying problems on the PC that can prevent Windows Updates from installing. So my main strategy with them is to try to fix the Windows Update issues. If we can get Windows Updates flowing again, that generally clears up the iTunes install errors +en passant.+
Head into your Windows Update, and check for any new updates. Do any fail? If so, open your Update History and doubleclick on the failure entries to bring up a small box with alphanumeric error message codes. Are you getting 8000FFFFs? (They often seem to be associated with an iTunes-install 0x8007054f.)
If you're getting 8000FFFFs, try the following Microsoft document:
[Windows Update Error 8000FFFF|http://windows.microsoft.com/en-US/windows-vista/Windows-Update-Error- 8000FFFF]
Head back to Windows Update, and see if you can get Updates to install successfully this time. If you can get updates now, stock up on any updates you're behind on. Once you're completely up to date in that regard, try another iTunes install. Does it go through properly this time?