ITunes won't open after installation

I realize many have had the same problem of not being able to open iTunes after installing the 7.2 upgrade. However, I haven't gotten an error message at all, it just won't open. Quicktime is working fine. Any advice would be greatly appreciated.
Thanks

It appears and then disappears after a few seconds.
okay. this (in conjunction with your other symptoms) is sounding like a digital signing issue with drivers on your PC that i've been seeing since the late iTunes 6.0.x days.
try running through the "Resolution" section from the following document:
Detecting digital signing issues in Windows XP
does your itunes start launching again?
(if so, it might be a good idea to download fresh definitions and run some vigorous spyware and virus scans. the initial deregistering of the dlls can be caused by malware.)

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ITunes won't open after OS update to Yosmite

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Thank you for using the Apple Support Communities
If you head into your applications folder and locate iTunes. Right click iTunes and show package contents. In there there will be a contents folder --> MacOS --> double click on the iTunes terminal icon. This should force iTunes to open via a terminal window and at the very least it will tell you what it is getting stuck on.

ITunes won't open after downloading 7.0

My iTunes won't open after downloading 7.0, what should I do?

replying to Robert
I get a Windows error code of 0x666D743F
First see:
iTunes 7 for Windows: iTunes fails to launch with an unknown error
There are some other possibilities
That error has been known to be produced by having Total Recorder or the Volume Logic plug-in installed on the PC.
For a workaround for Total Recorder, see:
chuckieb: One fix for iTunes 7 "0x666D743F" error
To check on the Volume Logic issue, see:
Troubleshooting issues with 3rd-party iTunes add-ons
For further possibilities, see other posts in chuckieb’s thread.

ITunes won't open after update; MacBook Pro, Mac OSX 10.6.8, iTunes version 11.1.5

iTunes won't open after update - help, please; MacBook Pro, Mac OSX 10.6.8, iTunes version 11.1.5.

i had a problem similar to yours and better yet, i have the fix for it. i downloaded maverick 4 months ago and was without itunes ever since. all itunes icon did was bounce. itunes would never open and whats more, is when i would try to update it, i would get a "thank you for downloading itunes!" page , but the download would never work. so i scoured the net for solves. nothing that worked. <4 months later> then last night i took a new approach. i decided even though maverick would not allow me to uninstall itunes, i would find a way to uninstall itunes. then i would reinstall back to 11.1.5 i was successful and heres what i did.
step one-
Back up your iTunes Library.itl file, found under ~/Music/iTunes
(even tho i didnt, i only had 3 artists in there at the time. and they didnt get erased but i advise you back up just in case.)
step two-
download itunes 10.7 from apple. i used this link Download it from Apple here
(i pulled the link from Aarons website (awesometast.com). you download 10.7 however you want but i used the link above and have had no issues).
although im not sure you need to do this step ( you may be able to download 11.1.5 itunes without 10.7, i did because i was following intructions from http://awesometoast.com/downgrading-to-itunes-10-7-from-itunes-11-on-osx/
step 3-
open Terminal
step 4-
enter in these 3 commands hitting return after each line. 1st line nothing seems to happen, 2nd line nothing seems to happen and 3rd line gives you a warning and requires password to continue. when i did it, my password didnt appear as i entered it and i hit return without looking, so i entered it in again, although im not sure i had to the 2nd time.
killall iTunes
killall "iTunes Helper"
sudo rm -rf /Applications/iTunes.app/
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drag off and dump the itunes icon (which now has the ? shadow in it) off your dock.
step 6-
install 10.7 itunes you downloaded earlier. (not sure if this part is neccesary. you may be able to just download 11.1.5 but i downloaded 10.7 because i was following Aarons steps.) itunes now works.
step 7-
go to apple and update to 11.1.5 itunes. install it. open it and you have itunes 11.1.5 in perfect working order. assuming you have a decent internet speed for the downloads, the whole process takes very little time.
with those steps above, you can solve itunes just bouncing and not launching issues and also the "thank you for downloading" and nothing downloads issue. enjoy. also i would like to give a shout out to http://awesometoast.com and thank Aaron for the knowledge that enabled me to get itunes back into my life.

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Refer this article to remove SC Info.sidb file
http://support.apple.com/kb/TS2363
If that does not work, Repair your Quicktime. START/ CONTROL PANEL/PROGRAMS n FEATURES/highlight QUICKTIME and click REPAIR

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I had similar problem this time and last time when I upgrade/update iTune, and subsequently solved the problem through the help of this person. You may give it a try and see if this works for you. It works for me now and then. Good luck.
https://discussions.apple.com/thread/3800524
Oliver

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I had similar problem this time and last time when I upgrade/update iTune, and subsequently solved the problem through the help of this person. You may give it a try and see if this works for you. It works for me now and then. Good luck.
https://discussions.apple.com/thread/3800524
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AFter latest OSX update iTunes won't open. Reinstalled iTunes. Reinstalled OSX update. When I click on icon in applications or in finder nothing happens.

This is what worked for me and others--original post found on this thread: Yosemite slow opening and cannot open itunes
This solved my question by Linc Davis.......
According to multiple reports on this site, Apple Support has given the following instructions to others who had a similar problem. I can't confirm that this procedure works or that it's necessary, but it won't leave you any worse off than you are now.
First, back up all data.
Select the iTunes icon in the Applications folder and open the Info window. Click the padlock icon in the lower right corner to unlock the settings.
In the Sharing & Permissions section, change the Privilege setting for each Name in the list to Read & Write. Close the window. If the settings aren't visible, click the disclosure triangle on the left so that it points down.
You should now be able to drag the iTunes application to the Trash and empty. Your iTunes data won't be affected.
Click the iTunes link at the top of this page, download the installer package and run it.
If iTunes still doesn't launch, or if you can't complete the procedure, reinstall the OS.

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Now, iTunes will not start. When i click on the icon, it bounces once and then nothing else happens. I've tried restarting, creating new accounts, and deleting all the com.apple.itunes preference files, but it's not working. What the ****? I can't undisable the iPad because iTunes won't start. How do I fix this?

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Hello,
Here's a little background on what's been going with itunes before the recent problem. These past couple weeks I've tried to update my itunes to 8.0.1 through the Apple Software Update. It never worked and at the end of the process it would tell me to try again or do it manually. Also, I downloaded two new videos today that were already in the correct format. I added it to the itunes library with no problem and tried to convert the videos to the correct format just incase it wasn't. It gave me the message that the video was already in the correct format. When I tried to sync it with my ipod it told me the videos weren't in the correct format.
Ok so for the overall the main problem right now is itunes won't open at all. I manually downloaded the update and I restarted the laptop after I finished updating itunes. Since then, itunes won't open and continuously gives me this message "The itunes application could not be opened. an unknown error occurred (-50)". I've restarted my computer a few times and looked up as many forums and solutions I could, but no luck. Please, if someone could help, let me know. Thank you.

Refer this article to remove SC Info.sidb file
http://support.apple.com/kb/TS2363
If that does not work, Repair your Quicktime. START/ CONTROL PANEL/PROGRAMS n FEATURES/highlight QUICKTIME and click REPAIR

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I've been running Itunes 10 on my macbook pro (Snow Leopard) until today when I updated to 11. The update appeared to complete successfully (no error messages). But afterwards when I try to open iTunes it immediately exits (with no user-facing message) and Console shows a message like this:
12/3/13 1:36:23 PM com.apple.launchd.peruser.501[143] com.apple.console ([0x0-0xdd0dd].com.apple.iTunes[1045]) Exited with exit code: 1
Some troubleshooting steps I've already tried:
Same thing happens if I try to start itunes in "safe mode".
Same thing happens if I try to start itunes from a different user account.
I've repaired permissions.
I've restarted a few times since installing Itunes and since repairing permissions.
Quicktime starts fine.
I'm not particularly interested in version 11 features, I'd be happy to have version 10 back -- or a working version 11.
But what I really really don't want is to lose any library information, playlists, play counts, ratings, etc. I want to be quite careful not to lose any of those.
One thing that looks suspicious to me is that it looks like in some way version 10 is still installed. At the end of the install, installd wrote both of these lines to the log in the same second:
12/3/13 11:39:10 AM installd[6928] install Installed "iTunes" (11.1.3)
12/3/13 11:39:10 AM installd[6928] install Installed "iTunes" (10.6.3)
Also if I open Software Update, under "Installed Software" it also shows both versions:
Thanks!

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Welcome to Apple Support Communities
It's a common problem that some users have after installing the most recent iTunes. Download and install again iTunes 11.0.3 to solve that problem > http://support.apple.com/kb/DL1614

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The OTA upgrade to 5.1 went great but after I installed itunes 10.6 and restarted my computer (laptop with windows vista) itunes won't open if I ununstall & reinstall will I lose everything?

Nope. But backing up before you do this is recommended.
Removing and reinstalling iTunes, QuickTime, and other software components for Windows Vista or Windows 7
http://support.apple.com/kb/HT1923
Removing and reinstalling iTunes, QuickTime, and other software components for Windows XP
http://support.apple.com/kb/HT1925

ITunes won't open after installation

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