Update Error: Insufficient Privileges

The installer has insufficient privileges to access this directory: D:\Program Files\Common Files\Apple\CoreFP.

That can indicate a damaged files or folder in that directory.

Let's try running a chkdsk over your D drive. There's instructions in the following document. 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.

http://support.microsoft.com/kb/315265 (How to perform disk error checking in Windows XP)

Does the chkdsk find/repair any damage? If so, can you get an install to go through properly afterwards?

Okay. Let's try renaming the folder. (That way the iTunes installer won't be hung up on the existing folder when it tries to replace it during the install process.)

In My Computer, open your D: drive.
Open the Program files folder.
Open the Common files folder.
Open the Apple folder.
Rename the CoreFP folder CoreFPOLD

Can you get the iTunes install to go through properly now?

I had quite the similar problem but only with different directory which is:

The installer has insufficient privileges to access this directory: C:\Program Files (x86)\iTunes\iTunes.Resources\zh_TW.lproj

I renamed the folder to zh_TW.lprojOLD and the installation was able to be completed. However, I cannot delete the partiular folder because "iTunesLocalized" file kept giving error 0x8007045D. Also each time I connect my iPhone4, it does not sync automatically. I have to open up iTunes manually to sync it. Please advise. Thank you.