Quicktime won't update, itunes won't open...having no luck :(

I'm getting an error message when I try to download the current quicktime. iTunes won't open without it. The error message is below:
It says "Could not open key:
HKEYLOCALMACHINE\Software\Classes\QuickTimePlayerLib.QuickTimePlayerApp\CLSID. Verify that you have sufficient access to that key, or contact your support personnel"
I tried a link that was posted in another discussion about manually editing the registry and it did not change anything. I still get the same error message. I've actually looked over quite a few suggestions in other discussions (like deleting quicktime all over the place and trying to reinstall it) and nothing seems to work. I finally was able to get the newest version of itunes downloaded. However, when I go to launch itunes it will not open b/c it says that i need the newest version of quicktime (which i cannot download). When I try to download it via standalone, it gives me a new error message similar to the original except now the location is QuickTime.QuickTime rather than QuickTimePlayerLib.QuickTimePlayerApp. Before I uninstalled QT, I was able to edit the registry for the QT Player LIb and App. Since they did nothing I unistalled it again. However, after I uninstalled it, (and reinstalled just itunes which it finally updated) I tried to reinstall and it would not install because the new error message is the most resent one above... in the registry it will not let me change/save any permissions changes to QuickTime.QuickTime. I've again tried to uninstall it but now QT isn't there at all. I've been at this thing for a week and nothing seems to be working... any suggestions? I would love help!!!!
Oh, and I don't know if this will help at all, but I have an ipod mini from like 2003... when I couldn't get itunes to update at all to the current version I decided to uninstall itunes and my ipod mini... so then i had to reinstall my ipod with the cd software that came with it which also installed itunes... it worked fine and would open... then I tried to update itunes again and somehow i managed to get it to update itunes... however, when i go to launch itunes it won't let me b/c of the version of quicktimes i currently have. Thanks in advance for any help!

so i tried to download the windows installer update from the link you gave me but now i'm getting a different error and it won't let me download the installer. The error reads:
Windows Script Host
Script: C:\DOCUME~1\Owner\LOCALS~1\Temp\IXP000.TMP\StartMsl.vbs
Line: 1
Char: 1
Error: ActiveX component can't create object: 'Scripting.FileSystemObject"
Code: 800A01AD
Source: Microsoft VBScript runtime error
I have no idea what this means or how to fix it. Please help!

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Message was edited by: Barbara Daniels1

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