ITunes stopped working on Windows 8. Error message 7: iTunes was not installed correctly.

I have Windows 8. Originally iTunes worked fine, then it couldn't update (said it was unsuccessful). Then it stopped working, so I (after much research) tried a long and tiresome method of removing all Apple products and re-installing them. I did this 3 times and it eventually worked and has been working fine for a few months. Recently, when trying to update, it has said "update successful", but when checking for new updates, finds the same one it supposedly just installed, wanting to install it again. For a few weeks now it has not worked at all, saying "error message 7: iTunes was not installed correctly" when I attempt to open iTunes. I can't bring myself to go through the whole process again of uninstalling and reinstalling everything, it took hours and it clearly doesn't solve the problem. I have no idea what the problem is. Reinstalling only iTunes doesn't work. The support pages have no advice available for my crappy version of Windows.
Please help me!

For general advice see Troubleshooting issues with iTunes for Windows updates.
The steps in the second box are a guide to removing everything related to iTunes and then rebuilding it which is often a good starting point unless the symptoms indicate a more specific approach. Review the other boxes and the list of support documents further down the page in case one of them applies.
Your library should be unaffected by these steps but there is backup and recovery advice elsewhere in the user tip.
It shouldn't really take that long to do, assuming it goes smoothly.
tt2

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The error 7 suggests you might also be getting a problem with your Apple Application Support as well as iTunes.
So let's try uninstalling both iTunes and Apple Application Suppport this time. When we reinstall iTunes, that should reinstall Apple Application Support as well. We'll take a few additional explicit precautions along the way too. Best to print these instructions out, because at one stage of proceedings you won't be able to use a web browser.
Preliminaries
Download and save a fresh iTunes installer to your hard drive. (Don't run the install on line and don't start the iTunes install just yet.)
http://www.apple.com/itunes/download/
Now, quit QuickTime (if you have that open) and Safari 4.0.4 (if you have that installed and open). Both applications use Apple Application Support, and they will interfere with the uninstall if you have them open.
*Uninstall phase*
Head into your "Uninstall a Program" control panel. Uninstall iTunes. Uninstall Apple Application Support.
(From this point on until we reinstall Apple Application Support, neither QuickTime nor Safari 4.0.4 will be able to run.)
Next we'll remove any leftover program files and folders.
(1) Open "Local Disk (C:)" or whichever drive your program files are stored on.
(2) Open the "Program Files" folder.
(3) Right-click on the iTunes folder (if it still exists) and select "Delete".
(4) Open the "Common files" folder.
(5) Open the "Apple" folder.
(6) Right-click on the Apple Application Support folder (if it still exists) and select "Delete".
Now empty your Recycle Bin and restart the PC.
*Reinstall Phase*
After the PC restarts, do not open any other applications. Disconnect from your network and/or the internet. Switch off all your security software (firewall, antivirus and antispyware).
Now start the install by doubleclicking the iTunesSetup.exe file you downloaded earlier.
Reenable all security software prior to reconnecting to your network and/or the internet.
Did the install seem to go through okay? If so, does iTunes start launching properly again?

ITunes stopped working on Windows 7, 64 bit. Uninstalled and attempted to reinstall. Windows installer error....iTunes. 10.6.3.25

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Many thanks.
Let's try the following user tip with that one:
"There is a problem with this Windows Installer package ..." error messages when installing iTunes for Windows

All of a sudden my iTunes stopped working, and I get the following error messages: 1. the program can't start because MSVCR80.dll is missing from your computer. Try reinstalling the program to fix this problem and 2. iTunes was not installed correct

All of a sudden my iTunes stopped working, and I get the following error messages:
1. the program can't start because MSVCR80.dll is missing from your computer. Try reinstalling the program to fix this problem
and
2. iTunes was not installed correctly. Please reinstall iTunes. Error 7 (Windows error 126).
Now I've checked the forums and followed the advice of uninstalling all Apple applications, rebooting, and reinstalling iTunes.
This is not working. I've tried installing as Administrator but doesn't make any difference at all.
There must be a way to fix this? I'm not a tech geek but I want to avoid having to take my laptop back to factory settings to sort this out.
Thanks

Click here and follow the instructions. You may need to completely remove and reinstall iTunes and all related components, or run the process multiple times; this won't normally affect its library, but that should be backed up anyway.
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When opening iTunes I continue to get the same messages, 'The program can't start because AVFoundationCF.dll is missing' and 'iTunes was not installed correctly. Error 7 (Windows error 126)' I've uninstalled, reinstalled many times - nothing! help please.

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Doublechecking. Have you also tried the following user tip?
Troubleshooting issues with iTunes for Windows updates

HT201210 iTunes update 11.1.4 produces an error message R6034 "An applicaton has made an attempt to load the C runtime library incorrectly" When that error is acknowledged, a second windows error 1114 "error 7" displays "iTunes was not installed correctly

iTunes update 11.1.4 produces an error message R6034 "An applicaton has made an attempt to load the C runtime library incorrectly" When that error is acknowledged, a second windows error 1114 "error 7" displays "iTunes was not installed correctly". I also tried to downloadiTunes 11.1.4 at th Apple website and that did not work either-It stalled with an erro message that stated the "mobile service" would not open HELP!

Hi Doug! I was having the same problem but after reading a lot of answers I found the solution. First of all you need unistall ALL THE SOFTWARE OF APPLE from your computer, I mean BONJOUR, QUICKTIME, ITUNES, APPLE SOFTWARE UPDATE, APPLE MOBILE DEVICE SUPPORT and the other one that is from compatibility with apps of apple, after that you must verify if this folders are removed if they don't then remove it:
C:\Program Files\Bonjour
C:\Program Files\Common Files\Apple\
C:\Program Files\iTunes\
C:\Program Files\iPod\
If you have a 64-bit version of Windows, you'll need to confirm that the following folders have been removed:
C:\Program Files (x86)\Bonjour
C:\Program Files (x86)\Common Files\Apple\
C:\Program Files (x86)\iTunes\
C:\Program Files (x86)\iPod\
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I was today invited to upgrade my iTunes when I logged on. Update failed. Every time I now try to open iTunes I get error messages. Second message reads "iTunes was not installed correctly. Please re-install iTunes. Error 7. Windows error 126"

I was today invited to upgrade my iTunes when I logged on. Update failed. Every time I now try to open iTunes I get error messages. Second message reads "iTunes was not installed correctly. Please re-install iTunes. Error 7. Windows error 126". I now can't sync my iPhoneand I am worried that if I re-install I will lose all my contacts,calendar, notes, etc.

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iTunes
QuickTime
Apple Mobile Device Support
Apple Application Support
Apple Software Update
Bonjour
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C:\Program Files (x86)\iTunes
C:\Program Files (x86)\Common Files\Apple
Restart the computer
Reinstall QuickTime
Reinstall iTunes
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I'm getting a n error message when I try to open Itunes. Itunes was not install correctly. Please reinstall itunes. Error 7 (Windows error 1114) This happened after I unsuccesfully tried to install an update. I have had itunes on this computer for three years. When I try to reinstall the latest version I get another message.Service Apple Mobile Device (Apple mobile Device) failed to start. verify that you have sufficient privileges to start system services. Abort, Retry, Ignore Does anyone know how to solve this problem?

Try the following user tip:
Troubleshooting issues with iTunes for Windows updates

HT1199 I updated Itunes on my PC and now when i try to open Itunes i get a error message saying "application failed to start because MSVCR80 was not found" then whenI close that pop up I get a error message saying "windows was not installed correctly Erro

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Click here and follow the instructions. You may need to completely remove and reinstall iTunes and all related components, or run the process multiple times; this won't normally affect its library, but that should be backed up anyway.
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I can't access my i tunes, getting message-System error-can't start because MSVCR80.dll is missing, also i tunes was not installed correctly-error 7(Windows error126)-What do i do to get into my itunes library?

Can someone please help me to get to my i Tunes library? I am getting the following message when trying to access i Tunes=i Tunes. exe-System error-can't start because MSVCR 80.dll is missing-Try reinstalling program. Also i Tunes was not installed correctly-Please reinstall i Tunes.-Error7(Windows error 126).

Try the following user tip:
Troubleshooting issues with iTunes for Windows updates

HT1926 Have the same problem as many other users: tried to update iTunes on Windows 7 today; first message "unable to locate component- MSVCR80.dll was not found" then "iTunes was not installed correctly. Please reinstall iTunes - Error 7 (Windows error 1

I have the same problem as many other users: updated iTunes on Windows 7 on Jan 26, 2014 and iTunes does not open. First message "unable to locate component- MSVCR80.dll was not found" then "iTunes was not installed correctly. Please reinstall iTunes - Error 7 (Windows error 126)". When will Apple fix this? Don’t feel like uninstalling all Apple software and then re-installing it as suggested, as I am on a terribly slow internet connection while travelling in the DR Congo.

Go to Control Panel > Add or Remove Programs (Win XP) or Programs and Features (later)
Remove all of these items in the following order:
iTunes
Apple Software Update
Apple Mobile Device Support (if this won't uninstall press on)
Bonjour
Apple Application Support
Reboot, download iTunes, then reinstall, either using an account with administrative rights, or right-clicking the downloaded installer and selecting Run as Administrator.
The uninstall and reinstall process will preserve your iTunes library and settings, but ideally you would back up the library and your other important personal documents and data on a regular basis. See this user tip for a suggested technique.
Please note:
Some users may need to follow all the steps in whichever of the following support documents applies to their system. These include some additional manual file and folder deletions not mentioned above.
HT1925: Removing and Reinstalling iTunes for Windows XP
HT1923: Removing and reinstalling iTunes for Windows Vista, Windows 7, or Windows 8
tt2

TS1717 Having trouble running iTunes version 11.0.2 on a Dell Laptop running Windows 7 Professional Service Pack 1. Keep getting an error message "the software required for communicating with iPods and mobile phones was not installed correctly..." reinst

Having trouble when I launch iTunes (version 11.0.2) on my Dell Laptop running Windows 7 Professional (service pack 1). I get an error message indicating software required to communicate with iPod and mobile phones was not installed correctly. Do you want iTunes to try to repair this for you? I normally respond with OK and it immediately tells me "could not be repaired. Please reinstall iTunes..." I have done this a number of times to no avail.

I also notice Quicktime is not getting installed at all.
That one is normal nowadays (ever since the iTunes versions 10.5.x).
The software required for communicating with iPods and mobile phones was not installed correctly. Do you want iTunes to try to repair this for you?
Let's try a standalone Apple Mobile Device Support install. It still might not install, but fingers crossed any error messages will give us a better idea of the underlying cause of why it's not installing under normal conditions.
Download and save a copy of the iTunesSetup.exe (or iTunes64setup.exe) installer file to your hard drive:
http://www.apple.com/itunes/download/
Download and install the free trial version of WinRAR:
http://www.rarlab.com/
Right-click the iTunesSetup.exe (or iTunes64setup.exe), and select "Extract to iTunesSetup" (or "Extract to iTunes64Setup"). WinRAR will expand the contents of the file into a folder called "iTunesSetup" (or "iTunes64Setup").
Go into the folder and doubleclick the AppleMobileDeviceSupport.msi (or AppleMobileDeviceSupport64.msi) to do a standalone AMDS install.
(If it offers you the choice to remove or repair, choose "Remove", and if the uninstall goes through successfully, see if you can reinstall by doubleclicking the AppleMobileDeviceSupport.msi again.)
Does it install (or uninstall and then reinstall) properly for you?
If instead you get an error message during the install (or uninstall), let us know what it says. (Precise text, please.)

How received the following error message: iTunes was not installed correctly. Please reinstall iTunes. Error 7 (Windows error 998). I did what was requested and reinstalled iTunes, but still get this error message. Help!

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b noir I never got any message about an entry point
Many thanks. If we're looking at a "naked" Error 7, I'd start with box two in the following user tip:
Troubleshooting issues with iTunes for Windows updates

ITunes stopped working on Windows 8. Error message 7: iTunes was not installed correctly.

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