TS3074 Hi, I have followed this advice numerous times, but my laptop still comes up with the same message, "iTunes was not installed correctly. Please reinstall iTunes. Error 7 (Windows error 5)." Quicktime also does not work. I have Windows 7, 32 bit.

Question

I have also reinstalled iTunes dozens (literally) of times. I simply cannot resolve this conflict. I've looked on many other websites, and there seems to be no solution!

Answer 1

update .netframework to latest version
then
Follow the instructions on this link, basically un-install everything, remove programs that says they are made by apple inc. (using add remove program)
http://www.reimageplus.com/fix-windows-127-error/   (Many thanks to reimageplus.com)
You will also need to check and verify that the following folders have been removed:
C:\Program Files\Bonjour
C:\Program Files\Common Files\Apple
C:\Program Files\iTunes
C:\Program Files\iPod
C:\Program Files\QuickTime
C:\Windows\System32\QuickTime
C:\Windows\System32\QuickTimeVR
dont forget to remove icloud also
you dont need to delete your itune music library though
If any of these folders still exist, delete them along with their contents. (if you cant delete them, right click and go to properties and then security and change the control of the fold to you)
do this for files under  program files and program file (x86) on your computer
once you have deleted everything, restart your computer. Then I repaired my registry using a registry repair program.
Important:-  instead of installing itunes I installed quick time, which installs apple application support (this is the corrupt file which is causing all the issues)
i then installed itunes and it all worked fine,
should take no longer than half hour to fix
hope this helps