ITunes install is creating unexpected errors (this has never happened)

Let me just start off by saying, I have been using iTunes for almost four years; I love the program. Recently, my friend left the country about a month and a half ago (he was the computer expert), I have been unable to access iTunes for about a week now based on the following error with Windows Vista: An error occurred during the installation of assembly 'Microsoft.VC80.CRT, version="8.0.50727.4053:, type="win32,publicKeyToken="1fc8b3b9a1e8e3b",processor Architecture="x86". It told me to refer to Help and Support for more information. HRESULT: 0x80070422.
I am no computer guru, I have no idea what this means or who can fix it. I have uninstalled and reinstalled iTunes over 10 times. Additionally, Apple Mobile Device Support will not uninstall. When I do get iTunes and Quicktime installed it tells me that I am missing CoreAudio.dll, CoreVideo.dll, and CoreAudioToolbox.dll; once again, I am not a computer guru, I have no idea what this means. Please help, I have over 8200 songs downloaded and over 200 videos that I cannot properly access without iTunes. Thank you.

HRESULT: 0x80070422
These ones are usually caused by an underlying problem on the PC that can also stop Windows Updates from installing. So my main strategy with them is to try to get the Windows update trouble fixed, which usually clears up the iTunes install trouble +en passant.+
Open your Windows Update and open your Update History. Have Windows Updates been failing for you recently? If so, doubleclick on the failures showing up in your update history. In the small box that comes up, what error code is shown for the Windows Update failures? Is it an 0x80070422 like your iTunes install error, or is it a different code? If they are different error codes, what error codes are you getting for the Windows Update failures?

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