Failing to install Quicktime

I have just bought an IPod Classic. I encounter a number of errors when loading Quicktime/Itunes. The errors are as follows
Error 1905 Module C|;ProgramFiles\Quicktime\QTOControl.DLL failed to unregister
This is followed by similar messages on QTOLibrary, QTUIPanel Control and QTSystem\Quicktimecheck.ocx
in all cases the errors have the text HResult -2197220472 Contact your support personnel
At the end of the process the following is displayed
HKEYLocalMachine\Software|Classes|Quicktimeplayerlib.QuickyimePlayerApp\CLSID
Verify that you have sufficent access to that key.
Any idea what is happening ?

HKEYLocalMachine\Software|Classes|Quicktimeplayerlib.QuickyimePlayerApp\CLSID ... Verify that you have sufficent access to that key.
I'm assuming you've got full administrative privileges in the user account you're getting that in.
If so, working through the options, starting with the simplest.
(1) Sometimes that particular variety of key error (CLSID) can occur if you're installing the QuickTime version in a different admin user account from one in which an earlier version of QuickTime is installed. If so, try logging out of the current user account (best not to use Fast user switching) and then logging in to the account from which the earlier version of QuickTime was installed, and trying the install of the later version of QuickTime from inside there.
(2) If QuickTime is returning a CLSID key error from inside whatever admin account you try the install from, try heading into regedit and checking to make sure you have full permissions on the Key that is throwing the error.
(3) If all the permissions appear to be in order or if Regedit isn't allowing you to open the relevant keys, then this can indicate a problem with the ACLs (access control lists) on the keys in your registry.
Under those circumstances, the technique from the following weblog entry has been of assistance with fixing recalcitrant CLSID key errors:
Aaron Stebner's WebLog: Solving setup errors by using the SubInACL tool to repair file and registry permissions

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