Patching impossible

Hey, i have a problem with patching from 3.2.2.10505 to 3.3.0

when i start the Updater i get this error message

The update could not be applied.
The file "C:\Program Files (x86)\Common Files\Blizzard Entertainment\World of Warcraft (2)\Uninstall.xml.temp" could not be created. If this problem persists, you may be able to solve it by uninstalling and then reinstalling the game. If you are unable to correct this problem, please contact Blizzard Technical Support. (InstallerFile::Create)

Is there any solution to this?

Thanks in advance