itunes can't open key to install

For "Could not open key/write value" errors when reinstalling try b noir's user tip:

"Could not open key: UNKNOWN\Components\[LongStringOfLettersAndNumbers]\
[LongStringOfLettersAndNumbers]" error messages when installing iTunes for Windows.

The technique can be applied to the branch of the registry mentioned in the error message.

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.

The further information area has direct links to the current and recent builds in case you have problems downloading, need to revert to an older version or want to try the iTunes for Windows (64-bit - for older video cards) release as a workaround for installation or performance issues, or compatibility with QuickTime or third party software.

Your library and device backups should be unaffected by these steps but there are links to backup and recovery advice should it be needed.

tt2

You're welcome. 🙂

tt2

Good evening!

I'm having exactly the same problem described in the first post (diferent key number) and tried everything in your tutorial. I still get the same "Could not open key:...." error and if I ignore it and keep on with the installation, then Itunes doesn't open as it gives me and error: Apple Application Support Error 2.

I tried using winrar to extract the installer files and it still doesn't work and keeps on with the same Error 2.

Please... I really need help!!! I really need itunes installed so that I can sync my iPhone!...

Help!

Can you post a screenshot of the error that you see?

tt2

I am running Win 10 and am getting the same errors except that I get 3. I have tried b noir's instructions and Full control is allowed but I did not have the option to "Replace owner." I have tried to fix this multiple times over the last few months and no success. I don't have iTunes installed at all but even when i try to uninstall Bonjour or Quicktime it gives me the same errors. I am getting really frustrated.

Replace Owner would be Change in the screenshot above. Have you tried ticking Replace all child object permissions and hitting Apply?

tt2