I receive the following error message when trying to install QuickTime for Windows "Error writing to file C:/Program Files/QuickTime/QTSystems/QuickTimeCheck.ocx. Verify that you have access to that directory."

I recieve the following error message when trying to install Quicktime for Windows "Error writing to file C:/Program Files/QuickTime/QTSystems/QuickTimeCheck.ocx. Verify that you have access to that directory."  I just trying to get the latest version of iTunes.  Thanks
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"Error writing to file C:/Program Files/QuickTime/QTSystems/QuickTimeCheck.ocx. Verify that you have access to that directory."
That one's consistent with disk/file damage. The first thing I'd try with that is running a disk check (chkdsk) over your C drive.
XP instructions in the following document: How to perform disk error checking in Windows XP
Select both Automatically fix file system errors and Scan for and attempt recovery of bad sectors, or use chkdsk /r (depending on which way you decide to go about doing this). You'll almost certainly have to schedule the chkdsk to run on startup. The scan should take quite a while ... if it quits after a few minutes or seconds, something's interfering with the scan.
Does the chkdsk find/repair any damage? If so, can you get an install to go through properly afterwards?