Could not open key....itunes fails to install

Running Xp sp 2 and logged to administrator account. The entire package including quick time, bonjour, software update, etc...successfully load and function; installer loads all itunes software until it reaches process of "writing registry values" and then hangs with error:
could not open key: hkeylocalmachine\software\mozillaplugins\@Apple.com\itunes, version= verify you have sufficient access to that key, or contact your support personnel"
under regedit, checked permissions on this key and "allow" "full control" are checked for the administrative profile that is logged in, so there should be access to that key. Tried disabling security software, uninstalling and reinstalling the entire package and while everything else will work, itunes still will not install; any suggestions that don't include an axe or sledgehammer appreciated.

under regedit, checked permissions on this key and "allow" "full control" are checked for the administrative profile that is logged in, so there should be access to that key.
Just doublechecking an exotic possibility. Does your SYSTEM account have full control of the key, too? (Peculiar things can happen when that loses permissions on a key.)

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