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boweasel Level 1 Level 1 (0 points)
I have deted and reinstalled several times, but I cannot get past this msg when I open iTunes:

"The iTunes application could not be opened. An unknown error occurred (-50)."

I have seen reference to this problem with 32 bit versions, and have attempted many of the suggestions - sfc /scannow, chkdsk /r, deleting and reinstalling iTunes. Nothing has worked.

Do I have to reinstall the operating system to get past this problem? Seems a bit drastic.

Windows 7
  • b noir Level 9 Level 9 (72,020 points)
    "The iTunes application could not be opened. An unknown error occurred (-50)."


    I suspect a broken Apple Application Support when I see that one, bo. I've tweaked the following set of instructions for your 64-bit system. (Some program file locations and the names of the installers are different than on 32-bit systems.)

    We'll try uninstalling/reinstalling both Apple Application Support and iTunes this time around, taking a few other explicit precautions just in case. Best to print off a copy of these instructions, because at one stage of proceedings you won't be able to use a web browser.

    Preliminaries

    Download and save a fresh copy of the iTunes64Setup.exe (64-bit installer file) to your Hard drive. (Don't run the install on line, and don't start the uninstall just yet.)

    http://www.apple.com/itunes/download/

    Quit any recent version of the QuickTime Player, Safari for Windows and/or the MobileMe Control Panel for Windows if you have them installed and open. (They all use Apple Application Support, and may interfere with the AAS uninstall if they are open.)

    *Uninstall Phase*

    Head into your "Uninstall a program" control panel. Uninstall iTunes. Uninstall Apple Application Support.

    (From this point onwards, recent versions of QuickTime, Safari and the MobileMe Control panel will not launch, until we get AAS reinstalled by reinstalling iTunes.)

    Next we'll remove any left-over program files and folders.

    In "Computer" open "Local Disk C:" (or whichever drive you have your program files installed on).
    Open the "Program Files" folder.
    Right-click on the "iTunes" folder (if it still exists) and select "Delete".
    Go back into "Local Disk C:" (or whichever drive you have your program files installed on).
    Open the "Program Files (x86)" folder.
    Right-click on the "iTunes" folder (if it still exists) and select "Delete".
    *Staying in the "Program Files (x86)" folder,* open the "Common Files" folder.
    Open the "Apple" folder.
    Right-click on the "Apple Application Support" folder (if it still exists) and select "Delete".
    Empty your Recycle Bin.

    *Reinstall Phase*

    Restart the PC. After the PC restarts do not open any applications. Disconnect from your network and/or the internet. Now switch off all your security software (firewall, antivirus, antispyware).

    Now start the reinstall by doubleclicking the iTunes64Setup.exe file you downloaded earlier. (This should also reinstall Apple Application Support.)

    Reenable all security software prior to reconnecting to your network and/or the internet.

    Did the reinstall seem to go through properly? If so, does iTunes launch properly for you now?
  • boweasel Level 1 Level 1 (0 points)
    I had already done all the steps up to:

    "Now switch off all your security software (firewall, antivirus, antispyware)."

    I have Windows Firewall turned on, and when I go to Control Panel-Windows Firewall, there is an option on the left to Turn the firewall on or off, but clicking on it (either right or left) does nothing.

    We have AVG 9.0 and when I open it and remove the check mark from Resident Shield, and click Save, I get a msg "These files can't be opened. Your internet settings prevented one or more files from being opened"
  • boweasel Level 1 Level 1 (0 points)
    Okay, I reset IE8 and have now disabled AVG, but still no joy on the firewall
  • b noir Level 9 Level 9 (72,020 points)
    Interesting ... perhaps try the *Verifying that Key Firewall and IPsec Services are Working* section from the following document:

    [Tools and Procedures Used to Troubleshoot Windows Firewall|http://technet.microsoft.com/en-us/library/cc749386(WS.10).aspx]

    Are any of the services disabled for you at the moment, bo?
  • boweasel Level 1 Level 1 (0 points)
    When I go to services, ther is no entry for Key Firewall or IPsec Services
  • b noir Level 9 Level 9 (72,020 points)
    Okay.

    Just doublechcking something further. When you're turning Windows Firewall off, as per:

    http://windows.microsoft.com/en-US/windows7/Understanding-Windows-Firewall-setti ngs

    ... is the trouble that the "Turn off Windows firewall" options can't be selected? Or are you able to select them, but when you click OK the Firewall stays on?

    (Trying to see if narrowing in on the symptoms can give us a leg-up with searching for solutions to the issue.)
  • boweasel Level 1 Level 1 (0 points)
    IPsec Policy Agent is not started
  • boweasel Level 1 Level 1 (0 points)
    I never get to the screen where I can turn the firewall off or on
  • b noir Level 9 Level 9 (72,020 points)
    Good lord. So when you, say, do:

    Open Windows Firewall by clicking the Start button , and then clicking Control Panel. In the search box, type firewall, and then click Windows Firewall


    ... the Firewall screen isn't coming up at all?

    Are your other control panels opening properly in there? Or is it just the firewall giving you trouble?
  • boweasel Level 1 Level 1 (0 points)
    I get the left pane with an option to *Turn Windows Firewall on or off* but nothing hapens when I right of left click it. It does turn blue and display the underscores, however.
  • boweasel Level 1 Level 1 (0 points)
    I DO get the firewall screen. Just can't do anything with it. It reads:

    Home or work (private) networks Not Connected
    Windows Firewall state On

    Public networks Connected
    Windows Firewall state On

    There is an option on the left 'Turn Windows Firewall on or off' that does turn blue and becomes underscored when I hover the mouse over it. But left or right clicking produce no result.
  • b noir Level 9 Level 9 (72,020 points)
    I see ... it's not letting us get through to the next screen where the firewall-turning-off controls live.

    Hmmm. Some research indicates that the effect of turning off the IPSec policy agent service on a PC should only prevent remote management of the Windows Firewall:

    http://wiki.blackviper.com/wiki/IPsecPolicyAgent

    But I think we'd better check to see what happens if we start the service, just in case.

    If you start the IPSec policy agent in your Services screen, does that 'Turn Windows Firewall on or off' link start taking you through to the next screen?
  • boweasel Level 1 Level 1 (0 points)
    Okay, the service is started, but it had no bearing on my ability to turn the firewall on or off, or to even get to the where I could accomplish that.

    Of course, I can stop the firewall from that same services page. Disable it as well.

    So I'll turn it off, and now that the AVG is also off, I'll disconnect and reinstall.
  • boweasel Level 1 Level 1 (0 points)
    Didn't make a **** bit of difference...
    At the finish of the install, there is a checkmark in the run itunes box. I got the same error as before:

    "The iTunes application could not be opened. An unknown error occurred (-50)"
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