Cannot install on Windows 7 64-bit

Trying to install iTunes onto my computer and having some problems. It was previously installed on my external HD, which recently was broken. Removed all traces of iTunes and Apple software etc. from my PC and tried a fresh install. Also used the Windows Installer cleanup to make sure all items were gone. restarted my PC.
Downloaded 64-bit version of the installer with no trouble and during installation I get the following problems...
Could not open key:
UNKNOWN\Components\DA42BC89BF25F5BD0AF18C3B9B1A1EE8\b25099274a207264182f8181add5 55d0. Verify that you have sufficient access to that key, or contact your support personnel.
Installer rolls back and tries again.
Could not open key:
UNKNOWN\Compnents\44BDC17A0EF6F334694F8CB5B64E8A0D\CB06793473776834B9D19AA0E3A82 2AE. Verify that you have sufficient access to that key, or contact your support personnel.
Installer rolls back then tries again and apparently completes succesfully, but after install the when trying to open iTunes the following errors occur:
iTunes was not installed correctly. Please reinstall iTunes.
Error 7 (Windows error127)
I can not figure out what the problem is. No other problems going on with any programs, iTunes! Any ideas?

Could not open key:
UNKNOWN\Components\DA42BC89BF25F5BD0AF18C3B9B1A1EE8\b25099274a207264182f8181add5 55d0. Verify that you have sufficient access to that key, or contact your support personnel
These ones are tricky. But the following instructions are worth a try.
First do a complete uninstall of iTunes and related components (but don't reinstall just yet), as per the following document:
Removing and reinstalling iTunes, QuickTime, and other software components for Windows Vista or Windows 7
a. Launch regedit (Start >> Search Programs and Files >> type Regedit and open the regedit that comes up.)
b. Access the following Location: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData \S-1-5-18\Components
c. Perform the following actions
i. Right Click on Components Folder
ii. Select Permissions
iii. Select Full Control and Read Permissions options
iv. Select Advanced Button
v. Select Owner Tab
vi. Select to Change Owner to the Administrators
vii. Check the option “Replace owner on subcontainers and objects”
viii. Select OK when prompted that it may not change all.
ix. Select Apply
x. Select Apply again
xi. Exit the Registry Editor
Now try reinstalling iTunes again. Does it go in properly this time?
Message was edited by: b noir

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