Norton Utilities Blocking Windows updates

 I have recently installed Norton Utilities (Version15.0.0.124) and I am unable to install the following Windows updates: Security Update for Microsoft NET Framework Windows 7 (KB2633870) and (KB2600217). I have tried to install these updates manually and I get a message that they have successfully installed only to find that when I shut the computer down it tries to download the same updates again. I have not previously had a problem installing Windows updates and I can only presume that the issue is a compatibility problem with Norton Utilities especially as after my first attempt to download these updates I scanned my computer with Norton Utilities and it discovered the following file extension issues: HKEY_CURRENT_USER\Software\Microsoft\Windows\Current

Version\Explorer\FileExts\MAPI\1PM.Note and Note.Read and when I press the repair button it ignores these issues.

 Any help would be greatly appreciated. ( I am using Windows 7 on a Sony Vaio VPCJ11M desktop).