ITunes 8.1.1 won't install

Okay I just downloaded iTunes 8.1.1 on my Windows PC and it won't install the update.
Here's what happens I go through the steps of installing the update -- the welcome screen provides info on what iTunes helps you do (work with iPod, iPhone, Apple TV etc and burning and importing audio CDs, plus buying songs from iTunes and video) then asks you to press next, next screen asks if you accept license agreement, select yes and click next. Next screen asks what language you want iTunes installed in (English US) and what location for me its C/Program Files/iTunes
Then press next and on the next screen it will install -- next screen shows up and then jumps directly to the iTunes has installed screen without doing so.
"Says iTunes Installer Completed"
"The installer encounted errors before iTunes could be configured.
Your system has not been modified. To retry these operations at a later time please return to the installer again. Click Finish to exit installer."
I have tried using both Apple Software Update which tells me iTunes + QuickTime could not be verified when the installation error occurs and the manual installation by downloading the file and launching it. Any ideas on
what's causing this?

Lots of times this is due to QuickTime not installing properly. iTunes depends on QT to play audio & video.
Try installing QT standalone, first. Make sure you pick the option withOUT itunes.http://www.apple.com/quicktime/download/
Choose SAVE, not run. Double-click the saved exe file to start the install.
If QT installs OK, and you can get it to open and run, then try the itunes install again.
Use this link and again, choose SAVE, not run.
http://www.apple.com/itunes/download/
If you get errors during the QT install, post back.

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Hey megannnnn14,
Thanks for the question. I understand you are experiencing issues installing iTunes for Windows. The following article may help to resolve your issue:
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http://support.apple.com/kb/HT1926
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Oct 29 21:47:47 graal Installer[13532]: @(#)PROGRAM:Install PROJECT:Install-572
Oct 29 21:47:47 graal Installer[13532]: @(#)PROGRAM:Installer PROJECT:Installer-430.1
Oct 29 21:47:47 graal Installer[13532]: Hardware: MacPro3,1 @ 2.80 GHz (x 8), 12288 MB RAM
Oct 29 21:47:47 graal Installer[13532]: Running OS Build: Mac OS X 10.6.1 (10B504)
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Oct 29 21:47:47 graal Installer[13532]: Env: TMPDIR=/var/folders/zX/zXSflpub2Ra57+8ZPe5U+++TI/-Tmp-/
Oct 29 21:47:47 graal Installer[13532]: Env: SHELL=/bin/tcsh
Oct 29 21:47:47 graal Installer[13532]: Env: HOME=/Users/oliver
Oct 29 21:47:47 graal Installer[13532]: Env: USER=oliver
Oct 29 21:47:47 graal Installer[13532]: Env: LOGNAME=oliver
Oct 29 21:47:47 graal Installer[13532]: Env: DISPLAY=/tmp/launch-T19Et7/:0
Oct 29 21:47:47 graal Installer[13532]: Env: SSHAUTHSOCK=/tmp/launch-NVXq7a/Listeners
Oct 29 21:47:47 graal Installer[13532]: Env: ApplePubSub_SocketRender=/tmp/launch-0vZ9Ta/Render
Oct 29 21:47:47 graal Installer[13532]: Env: COMMAND_MODE=unix2003
Oct 29 21:47:47 graal Installer[13532]: Env: _CF_USER_TEXTENCODING=0x1F5:0:3
Oct 29 21:47:47 graal Installer[13532]: iTunes Installation Log
Oct 29 21:47:47 graal Installer[13532]: Opened from: /Volumes/iTunes 9.0.2/iTunes.mpkg
Oct 29 21:47:58 graal runner[13536]: Administrator authorization granted.
Oct 29 21:47:58 graal Installer[13532]: =============================================================================== =
Oct 29 21:47:58 graal Installer[13532]: User picked Standard Install
Oct 29 21:47:58 graal Installer[13532]: Choices selected for installation:
Oct 29 21:47:58 graal Installer[13532]: Aktualisieren: "iTunes"
Oct 29 21:47:58 graal Installer[13532]: Aktualisieren: "Apple Mobile Device Support"
Oct 29 21:47:58 graal Installer[13532]: AppleMobileDeviceSupport.pkg : com.apple.pkg.AppleMobileDeviceSupport : 2.3.0.2790000.1835
Oct 29 21:47:58 graal Installer[13532]: Aktualisieren: "iTunes"
Oct 29 21:47:58 graal Installer[13532]: iTunesX.pkg : com.apple.pkg.iTunesX : 9.0.2.2790000.1835
Oct 29 21:47:58 graal Installer[13532]: iTunesAccess.pkg : com.apple.pkg.iTunesAccess : 9.0.2.2790000.1835
Oct 29 21:47:58 graal Installer[13532]: CoreFP.pkg : com.apple.pkg.CoreFP : 1.3.0.2790000.1835
Oct 29 21:47:58 graal Installer[13532]: =============================================================================== =
Oct 29 21:47:58 graal Installer[13532]: It took 0.00 seconds to summarize the package selections.
Oct 29 21:47:58 graal Installer[13532]: -[IFDInstallController(Private) _buildInstallPlan]: location = file://localhost
Oct 29 21:47:58 graal Installer[13532]: -[IFDInstallController(Private) _buildInstallPlan]: file://localhost/Volumes/iTunes%209.0.2/iTunes.mpkg/Contents/Resources/AppleMobi leDeviceSupport.pkg
Oct 29 21:47:58 graal Installer[13532]: -[IFDInstallController(Private) _buildInstallPlan]: file://localhost/Volumes/iTunes%209.0.2/iTunes.mpkg/Contents/Resources/iTunesX.p kg
Oct 29 21:47:58 graal Installer[13532]: -[IFDInstallController(Private) _buildInstallPlan]: file://localhost/Volumes/iTunes%209.0.2/iTunes.mpkg/Contents/Resources/iTunesAcc ess.pkg
Oct 29 21:47:58 graal Installer[13532]: -[IFDInstallController(Private) _buildInstallPlan]: file://localhost/Volumes/iTunes%209.0.2/iTunes.mpkg/Contents/Resources/CoreFP.pk g
Oct 29 21:47:58 graal Installer[13532]: Will use PK session
Oct 29 21:47:58 graal Installer[13532]: Starting installation:
Oct 29 21:47:58 graal Installer[13532]: Configuring volume "Mac Pro"
Oct 29 21:47:58 graal Installer[13532]: Preparing disk for local booted install.
Oct 29 21:47:58 graal Installer[13532]: Free space on "Mac Pro": 151,52 GB (151520894976 bytes).
Oct 29 21:47:58 graal Installer[13532]: Create temporary directory "/var/folders/zX/zXSflpub2Ra57+8ZPe5U+++TI/-Tmp-//Install.13532zXtI0K"
Oct 29 21:47:58 graal Installer[13532]: IFPKInstallElement (4 packages)
Oct 29 21:47:58 graal installd[13539]: PackageKit: ----- Begin install -----
Oct 29 21:47:58 graal installd[13539]: PackageKit: request=PKInstallRequest <4 packages, destination=/>
Oct 29 21:47:58 graal installd[13539]: PackageKit: packages=(\n "PKJaguarPackage <file://localhost/Volumes/iTunes%209.0.2/iTunes.mpkg/Contents/Resources/AppleMo bileDeviceSupport.pkg>",\n "PKJaguarPackage <file://localhost/Volumes/iTunes%209.0.2/iTunes.mpkg/Contents/Resources/iTunesX .pkg>",\n "PKJaguarPackage <file://localhost/Volumes/iTunes%209.0.2/iTunes.mpkg/Contents/Resources/iTunesA ccess.pkg>",\n "PKJaguarPackage <file://localhost/Volumes/iTunes%209.0.2/iTunes.mpkg/Contents/Resources/CoreFP. pkg>"\n)
Oct 29 21:47:58 graal installd[13539]: PackageKit: Extracting /Volumes/iTunes 9.0.2/iTunes.mpkg/Contents/Resources/AppleMobileDeviceSupport.pkg/Contents/Arch ive.pax.gz (destination=/var/folders/zz/zzzivhrRnAmviuee+++++++++/-Tmp-/PKInstallSandbox-tmp/Root, uid=0)
Oct 29 21:47:59 graal installd[13539]: PackageKit: Extracting /Volumes/iTunes 9.0.2/iTunes.mpkg/Contents/Resources/iTunesX.pkg/Contents/Archive.pax.gz (destination=/var/folders/zz/zzzivhrRnAmviuee+++++++++/-Tmp-/PKInstallSandbox-tmp/Root, uid=0)
Oct 29 21:48:02 graal installd[13539]: PackageKit: Extracting /Volumes/iTunes 9.0.2/iTunes.mpkg/Contents/Resources/iTunesAccess.pkg/Contents/Archive.pax.gz (destination=/var/folders/zz/zzzivhrRnAmviuee+++++++++/-Tmp-/PKInstallSandbox-tmp/Root, uid=0)
Oct 29 21:48:03 graal installd[13539]: PackageKit: Extracting /Volumes/iTunes 9.0.2/iTunes.mpkg/Contents/Resources/CoreFP.pkg/Contents/Archive.pax.gz (destination=/var/folders/zz/zzzivhrRnAmviuee+++++++++/-Tmp-/PKInstallSandbox-tmp/Root, uid=0)
Oct 29 21:48:04 graal installd[13539]: PackageKit: Executing script "./preflight" in /Volumes/iTunes 9.0.2/iTunes.mpkg/Contents/Resources/AppleMobileDeviceSupport.pkg/Contents/Reso urces
Oct 29 21:48:04 graal installd[13539]: PackageKit: Executing script "./preflight" in /Volumes/iTunes 9.0.2/iTunes.mpkg/Contents/Resources/iTunesX.pkg/Contents/Resources
Oct 29 21:48:04 graal installd[13539]: PackageKit: Executing script "./preflight" in /Volumes/iTunes 9.0.2/iTunes.mpkg/Contents/Resources/iTunesAccess.pkg/Contents/Resources
Oct 29 21:48:04 graal installd[13539]: PackageKit: Executing script "./preflight" in /Volumes/iTunes 9.0.2/iTunes.mpkg/Contents/Resources/CoreFP.pkg/Contents/Resources
Oct 29 21:48:04 graal installd[13539]: PackageKit: Executing script "./preupgrade" in /Volumes/iTunes 9.0.2/iTunes.mpkg/Contents/Resources/AppleMobileDeviceSupport.pkg/Contents/Reso urces
Oct 29 21:48:04 graal installd[13539]: ./preupgrade: launchctl: Error unloading: com.apple.usbmuxd
Oct 29 21:48:04 graal installd[13539]: ./preupgrade: (kernel) Kext com.apple.driver.AppleMobileDevice not found for unload request.
Oct 29 21:48:04 graal installd[13539]: ./preupgrade: Failed to unload com.apple.driver.AppleMobileDevice - (libkern/kext) not found.
Oct 29 21:48:04 graal installd[13539]: ./preupgrade: (kernel) Kext com.apple.driver.AppleUSBEthernetHost not found for unload request.
Oct 29 21:48:04 graal installd[13539]: ./preupgrade: Failed to unload com.apple.driver.AppleUSBEthernetHost - (libkern/kext) not found.
Oct 29 21:48:04 graal installd[13539]: PackageKit: Executing script "./preupgrade" in /Volumes/iTunes 9.0.2/iTunes.mpkg/Contents/Resources/iTunesX.pkg/Contents/Resources
Oct 29 21:48:04 graal installd[13539]: PackageKit: updatedyld_sharedcache -overlay /var/folders/zz/zzzivhrRnAmviuee+++++++++/-Tmp-/PKInstallSandbox-tmp/Root
Oct 29 21:48:04 graal installd[13539]: PackageKit: Shoving /var/folders/zz/zzzivhrRnAmviuee+++++++++/-Tmp-/PKInstallSandbox-tmp/Root (3 items) to /
Oct 29 21:48:07 graal installd[13539]: PackageKit: kextcache -system-caches
Oct 29 21:48:24 graal installd[13539]: PackageKit: kextcache -update-volume /
Oct 29 21:48:29 graal installd[13539]: kextcache: / locked; waiting for lock.
Oct 29 21:48:44 graal installd[13539]: kextcache: Lock acquired; proceeding.
Oct 29 21:48:44 graal installd[13539]: kextcache: Error populating config file /Volumes/Boot OSX/com.apple.boot.R/Library/Preferences/SystemConfiguration/com.apple.Boot.pli st.
Oct 29 21:48:45: --- last message repeated 1 time ---
Oct 29 21:48:45 graal installd[13539]: kextcache: /: trouble updating one or more helper partitions.
Oct 29 21:48:45 graal installd[13539]: PackageKit: Install Failed: (null)\nError Domain=PKInstallErrorDomain Code=121 UserInfo=0x100116590 "An error occurred while updating system extension information." Underlying Error=(Error Domain=NSPOSIXErrorDomain Code=70 "The operation couldn’t be completed. Stale NFS file handle") {\n NSLocalizedDescription = "An error occurred while updating system extension information.";\n NSUnderlyingError = "Error Domain=NSPOSIXErrorDomain Code=70 \"The operation couldn\U2019t be completed. Stale NFS file handle\"";\n arguments = (\n "-update-volume",\n "/"\n );\n}
Oct 29 21:48:45 graal Installer[13532]: install:didFailWithError:Error Domain=PKInstallErrorDomain Code=121 UserInfo=0x1070174c0 "An error occurred while updating system extension information." Underlying Error=(Error Domain=NSPOSIXErrorDomain Code=70 "Der Vorgang konnte nicht abgeschlossen werden. Abgelaufene NFS-Dateiverknüpfung")
Oct 29 21:48:45 graal Installer[13532]: Install failed: Die Installation ist aufgrund eines Fehlers fehlgeschlagen. Wenden Sie sich an den Hersteller der Software.
Oct 29 21:48:45 graal Installer[13532]: IFDInstallController 1900E820 state = 7
Oct 29 21:48:45 graal Installer[13532]: Displaying 'Install Failed' UI.
Oct 29 21:48:45 graal Installer[13532]: 'Install Failed' UI displayed message:'Die Installation ist aufgrund eines Fehlers fehlgeschlagen. Wenden Sie sich an den Hersteller der Software.'.

No need to apologise.
Okay ... it sounds like they've taken you all the way through the following document:
[Trouble installing iTunes or QuickTime for Windows|http://support.apple.com/kb/HT1926]
... so we'll try something different.
"There is a problem with this Windows Installer Package. A program required for this install to complete could not be run. Contact your support personnel or package vendor."
In recent times, I've seen a couple of cases of that message caused on Vista boxes, when the user account that the person was doing the install from inside lacked correct permissions on their C:\Program Files\ folder. They got similar symptoms to you ... some things installed, some things didn't. (It seems to differ from PC to PC precisely what ends up happening.)
So, go "Start > Computer". In "Computer", open your C drive (or whichever drive your Program files are stored on). Right-click "Program Files", and select "Properties". Click the "Security" tab.
Select the name of your User account in the list. Does that account have full control over the folder? If not, grant yourself full control.
After the Tab has done its thing, okay out, and try another iTunes install. Does it go through properly this time?

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unplug phone from computer.
Update computer ( apple menu)
DO NOT UPDATE ITUNES
After each update go back to apple menu and check for updates.
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I have tried uninstalling iTunes and all traces of it, and re-installing it, but keep getting an error msg that says "Problem with this Windows Installer package. A program required could not be run." I even tried a previous version of iTunes (10.1) and got the same error.
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I had the same problem with updating my itunes. I spent hours trying to figure out how to fix it
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Go to add or remove programs in the control panel, on Windows 7, just go to start, control panel, and then uninstall a program. Find Apple Software Update on the list, and click on repair. Once that is done, try to download iTunes again and it should work.

ITunes 8.1.1 won't install

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