Quicktime 7 (Resolution for some install / permission error)

Question

Add "Everyone" permissions and "System" permissions to the following registry keys if you are having a problem installing the standalone quicktime 7.0 program
Make sure these permissions are are for Full control and read.
HKEYLOCAL_MACHINE_SOFTWARE_CLASSESQuickTime.qt
HKEYLOCAL_MACHINE_SOFTWARE_CLASSESQuickTime.qti
HKEYLOCAL_MACHINE_SOFTWARE_CLASSESQuickTime.qtf
HKEYLOCAL_MACHINE_SOFTWARE_CLASSESQuickTime.qtl
HKEYLOCAL_MACHINE_SOFTWARE_CLASSESQuickTimePreferences
HKEYLOCAL_MACHINE_SOFTWARE_CLASSESQuickTimeExtension
HKEYLOCAL_MACHINE_SOFTWARE_CLASSESQuickTimeSystem
Once these are edited, rerun the Quicktime 7.0 Installer and it should install correctly.
Tested and confirmed today on this computer.
Regards
Adam

Answer 1

I've been dealing with the Quicktime 1402 installation error for a week and tried everything in this forum and the Quicktime forum. I also talked to Apple 3 times to no avail.
This was the solution that finally fixed my problem:
I went back to the detailed information found in Error Code 1402, which pointed me to the Quicktime registration key named quicktimeupdater.exe. I went into the registry (run, regedit) and navigated to this file and right clicked. Initially I got an error, but hit OK and right clicked again and this time it let me change permissions. I changed the owner to "Administrators" and it then allowed me to add "Everyone" and I set to "allow full control".
I closed the registry editor and successfully installed the standalone Quicktime and then iTunes. I didn't need to reboot. Finally after 5 days it appears to be working.
Hope this helps.