8 Replies Latest reply: Oct 29, 2011 6:51 AM by wordsmyth
softconn Level 1 Level 1 (0 points)
Attempting to upgrade to new itunes (22 Nov 2010). the above error occurs.
Have un installed/reinstalled - rebooted - run CC cleaner - uninstalled all apple apps - rebooted and re-downloaded "save" install file for itunes (64). Installed from saved download file.
Same error will not run.
No previous issues with itunes until the new release.
Any help appreciated..

Windows 7 64 Bit, Windows 7
  • b noir Level 9 Level 9 (72,020 points)
    Doublechecking ... have you also check on your .NET framework as per the following document?

    [iTunes for Windows: "iTunes was not installed properly. Please reinstall iTunes" message|http://support.apple.com/kb/TS3074]
  • Ollie0399 Level 1 Level 1 (0 points)
    Same issue as above. I have tried everything you suggested yet all results are the same. I continually receive the erro 7 windows error 126 and have also received:An error occurred during the installation of assembly ‘Microsoft.VC80.CRT, version=”8.0.50727,4053”,type=”win32”,publicKeyToken=”1fc8b3b9a1e18e3b”,process or Architecture=”x86”. Please refer to Help and Support for more information. HRESULT:0x800736B3.

    My errors also started with an update around Dec 20th 2010.
    Please help!
  • calpolypaul Level 1 Level 1 (0 points)
    I had a similar problem and tried all of the solutions presented. What worked for me was to run iTunes in a compatibility mode. Right click the iTunes icon and select properties. Click on the compatibility tab, under display settings, check "Disable visual themes" You will get a window pop-up when loading iTunes requesting that iTunes should not be run in this mode, but hit ok and iTunes should load up.
  • Ollie0399 Level 1 Level 1 (0 points)
    Thanks for the suggestion, no luck, same errors. Thx.
  • freeride01 Level 1 Level 1 (0 points)
    Hi Had the same problem. Bloody annoying.
    Anyway finally fixed it by copy all missing .dll files from someone else who had loaded ITUNES.
    Luckily my girlfriend had the files and i just copied the missing files into the same directory. By comparing what she had and what i had.
    If this does not work tryto overwrite the Mediatoolbox.dll file.
    Then i tried Itunes and it worked again.
    Files can be found in.
    C:\Program Files\Common Files\Apple\Apple Application Support
    Then just copy and paste missing .dll files into this location.
    Hope this helps anyone.
  • drnakagawa Level 1 Level 1 (0 points)

    Thank you

    It worked!

  • squawk1200 Level 1 Level 1 (0 points)

    not working here, windows 7 64 bit, have tried everything.


    anybody want to buy a now-useless ipad2?

  • wordsmyth Level 1 Level 1 (0 points)

    Copying the DLL file got itunes to open on my computer, but now I am getting a different error message:


    "itunes was unable to load data class information from sync services. Reconnect or try again later."


    Can anyone offer a suggestion on the fix for that?


    Thanks in advance,