This seems to happen with every fifth or sixth iTunes update, and iTunes is incapacitated until the following update. In this case, the error message is as follows:
An error occurred during the installation of assembly 'Microsoft VC80.CRT .type="win32" .version = "8.0.50727.6195" HRESULT: 0x80070091
ZT desktop computer-OTHER, Windows 7, 60 GB SSHD; 1 TB HD
Once I disabled all components of Windows Firewall (domain profile, private profile and public profile), And disabled my aftermarket computer protection (AVG), it finally installed. I wasn't able to see the Domain Profile disable originally, just private and public profile. So, i had to dig a little deeper to find where to disable the domain profile.
For general advice see Troubleshooting issues with iTunes for Windows updates.
The steps in the second box are a guide to removing everything related to iTunes and then rebuilding it which is often a good starting point unless the symptoms indicate a more specific approach. Review the other boxes and the list of support documents further down the page in case one of them applies.
Your library should be unaffected by these steps but there is backup and recovery advice elsewhere in the user tip.
If you are running 64-bit Windows and the above steps haven't helped try installing the version of iTunes that can be downloaded from this support document. iTunes 12.1 for Windows (64-bit — for older video cards)
tt2
Uninstalled all successfully save Apple Mobile Device Support, which remains on program list despite Windows' claim that it's not installed. Deleted all folders except Bonjour; Windows tells me mDNSResponder.exe is in use and folder cannot be deleted until it's closed. I have no idea how to do that, or why it would be in use. Tried installation once more, and this time got the familiar error message above, followed moments (after rollback) later by Service 'Apple Mobile Device Service' failed to start. Verify that you have sufficient privileges to start system services. I am the only user of this computer, and am identified as its "administrator." I remain in the dark.
See Note 3 below the second box.
tt2
Hi there,
I tried a number of the fixes listed around the internet to do with this error also. I was having the same problem on an HP dv6 Notebook running Windows 7 x64 Home Premium.
In the end I found the issue wasn't with the iTunes install, but with the Visual C++ Redistributable sub-components that are installed as part of the iTunes install package. I found the same errors when attempting to install the standalone version of Visual C++ Redistributable as well (versions 2005, 2008, and 2010 - both x86 and x64).
Fix
===
After hours of banging my head against it I finally found that disabling the Windows Firewall did the trick. I was able to install both the stand alone versions of Visual C++ and iTunes as you'd normally expect to be able to.
No idea why having the Windows Firewall on would cause this issue.. but there you go. Hope this helps someone else in need.
Thanks for this tip. 🙂
tt2
Hi, folks--
First, let me thank both of you for time and suggestions. Alas, I'm no better off than when I first posted. Tried tt2's suggestions first, to no avail. Now I've just disabled Windows Firewall and tried again to install iTunes 12.1. First came error message concluding with HRESULT: 0x80070091, followed by rollback and then the marvelously redundant Service 'Apple Mobile Device Service' (Apple Mobile Device) failed to start. Verify that you have sufficient privileges to start system services. I do. I am the "admin." (Coo Coo Ca Choo.) So I clicked on Ignore, and installation resumed, only to conclude with Apple Application Support was not found. Apple Application Support is required to run iTunes. Please uninstall iTunes and then install iTunes again. Error 2 (Windows Error 2)
So...around and around we go. I have run chkdsk on the hard drive. I've gone to the genius bar at the local Apple Store. Many questions swim in my brain, such as: Why is 'Apple Mobile Device Service' relevant to an iTunes installation on a desktop computer? And: Is this, in fact, an iTunes problem, or is it a Windows problem, or is it a compatibility problem between the two? And: Had I been born 20 years later, would I understand all this cryptic nonsense?
Please see my reply to tmatofa. Thanks!
Ready to roll up your sleeves and try again? 🙂
The steps below should result in a set of detailed log files on the desktop for the selected installer. Once generated review the logs for clues as to why particular components would not install.
iTunesSetup.exe = 32-bit iTunes for Windows
msiexec /i C:\AppleApplicationSupport.msi /l*v "%USERPROFILE%\Desktop\Log_AAS.txt"
msiexec /i C:\AppleMobileDeviceSupport.msi /l*v "%USERPROFILE%\Desktop\Log_AMDS.txt"
msiexec /i C:\AppleSoftwareUpdate.msi /l*v "%USERPROFILE%\Desktop\Log_ASU.txt"
msiexec /i C:\Bonjour.msi /l*v "%USERPROFILE%\Desktop\Log_Bonjour.txt"
msiexec /i C:\iTunes.msi /l*v "%USERPROFILE%\Desktop\Log_iTunes.txt"
itunes6464setup.exe = 64-bit iTunes for Windows
msiexec /i C:\AppleApplicationSupport.msi /l*v "%USERPROFILE%\Desktop\Log_AAS.txt"
msiexec /i C:\AppleApplicationSupport64.msi /l*v "%USERPROFILE%\Desktop\Log_AAS64.txt"
msiexec /i C:\AppleMobileDeviceSupport6464.msi /l*v "%USERPROFILE%\Desktop\Log_AMDS6464.txt"
msiexec /i C:\AppleSoftwareUpdate.msi /l*v "%USERPROFILE%\Desktop\Log_ASU.txt"
msiexec /i C:\Bonjour64.msi /l*v "%USERPROFILE%\Desktop\Log_Bonjour64.txt"
msiexec /i C:\iTunes6464.msi /l*v "%USERPROFILE%\Desktop\Log_iTunes6464.txt"
itunes64setup.exe = 64-bit iTunes for Windows (for older video cards)
msiexec /i C:\AppleApplicationSupport.msi /l*v "%USERPROFILE%\Desktop\Log_AAS.txt"
msiexec /i C:\AppleMobileDeviceSupport64.msi /l*v "%USERPROFILE%\Desktop\Log_AMDS64.txt"
msiexec /i C:\AppleSoftwareUpdate.msi /l*v "%USERPROFILE%\Desktop\Log_ASU.txt"
msiexec /i C:\Bonjour64.msi /l*v "%USERPROFILE%\Desktop\Log_Bonjour64.txt"
msiexec /i C:\iTunes64.msi /l*v "%USERPROFILE%\Desktop\Log_iTunes64.txt"
tt2
I was getting exactly the same thing after i tried updating i tunes prompted to uninstall & reinstall but wouldn't reinstall
contacted apple support after 2 hours on screen share & unistalling reinstalling it still wasn't sorted still waiting a week later for a follow up call
........nothing so thought i check this forum & found your question followed turingtest2 advise & tried downloading the 12.1.1 64 bit for older video cards & hey ho worked first time give that a try
thanks for your advice was having the same problem as pedl, .....had 2 hours of screen share support from apple who couldn't sort it
awaiting a follow up call a week later ...nothing ..............so checked this forum tried the download for older video cards & worked first time
after 2 days of trying uninstall & reinstall disabling Norton, was tearing my hair out ! so thanks again so far so good : )
You're welcome. 🙂
tt2
Help please!
I have exactly the same problem. I have a Dell Windows 7 x64. Can't install iTunes 12.1.1 not even for older video cards.
I have switched off Windows Firewall
Could you please advise how many versions of Visual C++ I should have on my machine? Should I delete all the current ones or repair them in Control Panel? Is this going to cause other problems???
Should I reinstall from here? http://www.microsoft.com/en-pk/download/confirmation.aspx?id=21254
-------------------------------------------------------------------------------- -------------------------------------------------------------------------------- -------------------------------------
After hours on the forums and with Tech Support, I'm sure I'm VERY close to being able to reinstall iTunes but I'm stuck on the Visual C++ problem which I know needs to be fixed first.
Help please!
Thanks
Mike
Hi,
I'm afraid I don't have a definitive answer for you, but having multiple copies of various library components is par for the course so I don't think you necessarily need to delete anything other that Apple's components before reinstalling. The best advice I have for you right now is probably in my post above. Try installing as individual components and gather logs for those components that won't install properly.
tt2
Created a login here just to thank turingtest2 and point out his post to other lurkers.
The '64 bit for older video cards' version worked for me. I'd been stuck for days unable to get apple mobile device service to work even following the recommended 'remove all and try again' approach.
Thanks, and do try for those with same problem!
Can't install iTunes 12.1 on Windows 7 64-bit.
