Unable to install QuickTime 7.7.5

Hi,
I am using Windows 8.1 and was notified of the above update this morning.
The update failed twice and it told me to try manually which I did. This didn't work either.
"The installer has insufficient priviledges to access the directory C;\Program filesx(86)\Quicktime. The installation cannot continue. Log on as administrator or contact your system administrator"
Have tried 3 times.
I am on as the administrator.
Any ideas please? Never had this happen before.
Thanks,
Jayne Perry

You're welcome!
YES that worked!
But why?
When the QuickTime installer runs, the first thing it tries to do is uninstall the previous version. If there's damage to QuickTime program files (or something else amiss), that can stop the install. (It can give a message talking about privileges and permissions when that happens.)
So what we did was "hide" the damage from the installer. When it went to remove the previous version, it didn't see any old program files lying about (because the installation database won't be looking for anything in a folder called "QuickTimeOLD"), so instead of getting hung up on removing the old folder and/or files in it, it just put in a new one and a new set of program files when it went on to install the newer version.

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Following hard drive problem a few months ago, I had reinstalled XP onto a new primary drive, labeled F. A second drive is also installed on the machine, labeled C, which had come from another computer. This also has a copy of XP in it, although it does not boot from this drive. In this case however, the path for the msiexec service was pointing to the old C drive.
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