Quicktime and iTunes won't play anything, require computer restart.

Since installing Lion and the latest iTunes, I cannot consistently play songs or videos in iTunes (or Quicktime, for that matter). I hit the play button and it changes to a pause button, but the file doesn't progress past 0:00. I try pausing and restarting the song (or movie) and it doesn't play. This occurs both with songs on my computer and in previews from the iTunes Store. Restarting my iMac seems to fix it, but the problem returns after a period of use. Quitting and restarting iTunes does not fix the problem.
It seems that I need to reinstall Quicktime and/or iTunes (not sure how), but I'm open to other suggestions. Any help would be appreciated.

jmaybee,
You need to go get a program called Pacifist 3.2.2 (it's shareware but you can use it for free - I cannot say enough of how great this program is, it has saved my skin more times than I can count)
http://www.charlessoft.com
Then get the Snow Leopard disk that came with your system and put it in the optical drive and let it mount.
Using Pacifist, use the "Open Apple Install Discs" button, select the Snow Leopard disk and let it read the package installers. This may take some time, as it's got to read the DVD and pull up all the installer .pkg files..
When Pacifist is done, you'll see something that looks like this:
http://home.comcast.net/~foodandart/MacForums/PacifistSnowLeopardQT.jpg
Dig down into the installer packages thusly:
Contents of OSInstall.mpkg
   Contents of EssentialSystemSoftware
      Contents of EssentialSystemSoftwareGroup
         Contents of Essentials.pkg
            Applications
               QuickTime Player.app
Select the QuickTime player to highlight it, then you just hit the large arrow at the upper left corner of the Pacifist window (sorry for my black Snow Leopard scheme making things hard to see) and it will ask you if you are certain and also to backup files (why? they're gone already!) and it will install the QuickTime Player to the default location in your Applications folder.
I *just* tried this with my own system and tossed my original copy of QTX on the Desktop and the new install works perfect.
There you go..
Regards,
Deb.

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I uninstalled/installed QuickTime as you suggested and there were no error messages on either. To verify that the installation completed successfully, I played a movie trailer from Apple's website. The audio was fine but there was no sound. And, of course, there was no sound in iTunes.
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I'm now in the process of downloading driver updates from IBM's ThinkPad support website.
For now, at least, I'm stuck with a dumb laptop...literally!
Any suggestions/links for how to troubleshoot/fix my sound problem would be most appreciated.
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Description of the Windows Installer CleanUp Utility
Next, we’ll manually remove leftover program files and folders.
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2. In My Computer, open Local Disk.
3. Open Program Files.
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5. Navigate to C:\Windows\system32\.
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7. Restart your computer.
next, we'll try to get a fresh copy of QuickTime into your PC by doing a repair install of itunes.
switch off antivirus and antispyware applications prior to the repair install.
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Re: Quicktime and iTunes Won't Open after updating to iTunes 7.3.1

i have been trying to install the itunes for about 2 or 3 hrs str8.....im gettin very agitated too
when i click for it to download the itunes it says ty for downloading but nothing never pops up....when i try to install the quick time it says the same but nothing NEVER happens....its like i cant install either of them if my life depended on it and im tired of all my time being wasted

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Description of the Windows Installer CleanUp Utility
Next, we’ll manually remove leftover program files and folders.
1. On the Start menu, click My Computer (or double-click My Computer on the Desktop).
2. In My Computer, open Local Disk.
3. Open Program Files.
4. Right-click on the QuickTime folder and click Delete from the shortcut menu.
5. Navigate to C:\Windows\system32\.
6. Remove the files QuickTime.qts and QuicktimeVR.qtx.
7. Restart your computer.
next, we'll try to get a fresh copy of QuickTime into your PC by doing a repair install of itunes.
switch off antivirus and antispyware applications prior to the repair install.
go into Add/Remove and select itunes. click "Change" and then click "Repair".
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I have spent the last 2 hours reading other posts and have not found a solution yet.
I am getting; +Itunes has encountered a problem and needs to close+
and; +Quicktime Player has encountered a problem and needs to close+
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reinstalled and still nothing
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but hitting update gives me the error:
+An Exception occurred while trying to run " C:\windows\system32\shell32.dll,+
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Hopefully I have supplied enough information
Thanks for helping
Message was edited by: m_S99
Message was edited by: m_S99

Id try un-installing again and using your revo and ccleaner. Then install Windows Installer Cleanup Utility you'll have to download it from The Geeks, don't think Microsoft still has it at their site.
http://majorgeeks.com/WindowsInstaller_CleanUp_Utilityd4459.html
When you run Windows Installer Cleanup Utility your going to click on any QuickTime showing up in there, this will clean up old QuickTime installer files. iTunes you want to remove also, but that may show up as 10.1.2 which would be the version of iTunes. Now hopefully a clean install should now go thru and work

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All of a sudden, my iTunes won't play music.

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Regards,
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Quicktime and iTunes won't play anything, require computer restart.

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