Please note - To avoid any complications while patching, we recommend doing the following:
Please clear out the Temp folder on your computer. When you are ready to install the patch, disconnect your internet connection and shut down all programs (including anti-virus and similar). Now run the patch. We recommend that you leave the patch to install overnight, and that you do not use the computer whilst the patch is being installed. You may also want to try installing the patch under Safe Mode in Windows.
Follow these instructions also. Safe mode is a bit OTT though.