Trying to update iTunes on a laptop with Vista.

A friend is trying to update iTunes on a laptop with Vista. She gets this: Error writing to file: C:\Config.Msi.\78efb0.rbf. Verify that you have access to that directory.
I thought maybe it was an issue with Administrator privileges, but she's the only user on the computer. The file does not already exist in the root directory. (I was thinking of deleting it.) I googled it and got nothing. Any ideas?
Thanks.

No problem.
If there is Kaspersky on board, we should try some general-principles getting-past-security-software-interference troubleshooting.
Download and save a fresh copy of the iTunesSetup.exe (32-bit installer file) or iTunes64Setup.exe to your Hard drive. (Don't run the install on line, and don't start the install just yet.)
http://www.apple.com/itunes/download/
Restart the PC. After the PC restarts do not open any applications. Disconnect from your network and/or the internet. Now switch off all your security software (firewall, antivirus, antispyware).
Now start the install by doubleclicking the iTunesSetup.exe (or iTunes64Setup.exe) file you downloaded earlier.
Reenable all security software prior to reconnecting to your network and/or the internet.
Any better luck with the security software shut down?

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