Can't open any version of iTunes or use quicktime

yesterday i downloaded and installed iTunes 7 (before i knew that there was problems with it). when i opened it massive chunks of my library were missing so i decided to revert back to an earlier version of itunes. removed iTunes 7 and installed iTunes 6.0.5 (think that's the correct number) but it wouldn't open. it comes up with a message saying that iTunes had encountered an unexpected error and needs to close. i've tried uninstalling and reinstalling different versions of iTunes and rolling back to various system restore points on my computer but i constantly get the same message. I can't use quicktime either - it just comes up with the same message.
HELP!!!

I can't use quicktime either - it just comes up
with the same message.
just doublechecking your precise error message. is it
an "itunes has encountered a problem" message? or is
it something a bit different? if it's different, what
is the precise text? (include error message numbers
if you're getting any.)
i don't know if this will mean anything to you...
Faulting application pictureviewer.exe, version 7.1.3.100, faulting module unknown, version 0.0.0.0, fault address 0x63656666.
for some reason the error message i was getting on screen when i tried to open QT isn't coming up now but QT isn't opening either. i got that text from going to control panel>admin tools>event viewer. the text i was getting previously when i tried to open QT was "quicktime has encountered an unexpected error and needs to close" (or something v similar).
Windows XP

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I can't install any version of Itunes !!!

I can't install any version of Itunes, the installation disappear after 1 second.
Nothing happend after, i've tried many things :
- Restart
- Set up permissions
- Disk repair
I'm using a PC with windows 7.
Help !!!

Hello Ebelhaj,
I want to recommend this article for you.
Trouble installing iTunes or QuickTime for Windows
http://support.apple.com/kb/ht1926
It has some general troubleshooting for being unable to install iTunes and some additional troubleshooting, here is an over view of the troubleshooting to be done:
General installation troubleshooting
1. Empty your Temp directory and restart
2. Completely remove iTunes and related components
3. Install the latest version of iTunes
Additional troubleshooting
After performing each of the steps below, you will need to completely remove iTunes and related components and then install iTunes again to determine whether the issue is resolved.
1. Make sure you have administrator account access
2. Make sure your folder names don't contain strange characters
3. Get the latest Windows updates
4. Disable other conflicting software
Each blue link has its own troubleshooting step.
Cheers,
Sterling

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When i opened my iTunes, it told me i needed to upgrade to the newer version of iTunes to play my an album that i pre-ordered. So i did, but when i tried to open it, an error message popped up...something about an error with Quicktime.
I tried re-installing iTunes all over again, but the same message came up. So i deleted Quicktime from my computer, but left iTunes, & then installed Quicktime.
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Re-installing Quicktime doesn't work & re-installing iTunes doesn't work. What else can i do???? This happened the last time i updated too, so i am pretty ****** off. Any suggestions??????

I was having a similar problem and searched this forum for 2 days trying to find the solution...and couldn't!
I decided to solve try a few things myself.
I turned the SpyWare off first then . . .
1 . I opened the Register Editor, by typing in "Regedit" in the run application for XP or start search for Vista.
2 . I searched all of the files, around six of them, and deleted ALL quicktime and itunes folders.
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4 . After that I went back to C:\ and went into Windows and deleted a file named QuickTime VR and all other QuickTime and iTunes files.
5 . Restarted the computer
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Hi, I just got a new Dell XPS 1210, I turned off all of the security Sw and tried to downlaod V7 software from the site, it loaded than said itunes had a problem and had to close, I tried it at least 5 times with no joy, I than moved a file from my old laptop (V6.0.4) and it loaded and said had to shut down due to a problem, i spent 3 hours on the phone with Dell tech support who told me they had no idea, does anyone have any ideas why no version of iTunes will launch on my new system? (XP Pro, with 2GB RAM, 80GB HD)
Thanks from a newbie

3rdtoy,
If iTunes is crashing, why don't you get a crash log and send it to those lazy Apple engineers.
Typically, you'll need to configure Dr. Watson on your PC in order to generate crash logs. Windows start menu -> Run. Type in "cmd". Hit return. At the prompt in the command line window that comes up, type in
drwtsn32 -i
And hit return.
This will create crash logs in Documents And Settings\All Users\Application Data\Microsoft\Dr Watson\. There'll usually be a file in here called "drwtsn32.log" If there's already a file there, it most likely has multiple crash logs in it (new crash logs are just appended to the end of the file). So, delete this file. This will make sure you're not sending extra information I don't need. These crash logs are text files, so you can open them in notepad or whatever to see what information you're sending.
So, get the machine setup to collect crash logs, do the thing that makes iTunes crash. Send it to our buddy Roy. It doesn't hurt to put the URL to this discussion thread because he gets a lot of these messages and is easily confused. Tell him Toonz sent ya.

Can't open latest version of iTunes in Windows 8

I have installed the latest version of iTunes for Windows 8. I cannot open iTunes. I attempted opening in Safe Mode, received the Safe Mode pop-up, selected "Continue," and iTunes was not opened. What can I do to access iTunes?

Hey clappinghappy,
Thanks for the question, and great troubleshooting so far. If you issue persists after attempting to open iTunes in safe mode, the next step would be to test in a new user account:
iTunes for Windows Vista, Windows 7, or Windows 8: Fix unexpected quits or launch issues
http://support.apple.com/kb/TS1717
After isolating the issue further, see the applicable section (User-specific troubleshooting or System-wide troubleshooting)
Thanks,
Matt M.

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Then I downloaded iTunes 6 and ran the installer.
No. Way. The iTunes 6 installer is freezing as well.
What is going on with my computers ability to install iTunes?

Try and d/l a fresh .dmg.
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Can't open any version of iTunes or use quicktime

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