Sophos AV Home Edition Auto Updates causing authorization errors every two hours

Hello,

Each time the autoupdate for Sophos AV Home Edition is run, I get the errors in the Console seen in the log below.

I know that it is Sophos AV Home Edition, because the IFPKInstallElement (19 packages) name and # of packages is the same as when the program was initially installed. As this happens on a regular basis (see "Every Two Hours", below) due to the autoupdates, perhaps there is a permissions setting or something else that is wrong with my system, or something about the Sophos program that is causing this.

I am running OS X Lion 10.7.3.

Some assistance would be very much appreciated.

Thanks!

Full Error message:

5/22/12 11:23:20.382 AM installer: Configuring volume "Macintosh HD"
5/22/12 11:23:20.395 AM installer: Free space on "Macintosh HD": 418.5 GB (418495946752 bytes).
5/22/12 11:23:20.395 AM installer: Create temporary directory "/var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/T//Install.114686qdrnd"
5/22/12 11:23:20.402 AM installer: IFPKInstallElement (19 packages)
5/22/12 11:23:20.851 AM authorizationhost: SFBuiltinEntitled: installer is not entitled for system.install.app-store-software
5/22/12 11:23:20.903 AM authorizationhost: SFBuiltinEntitled: installer is not entitled for system.install.app-store-software
5/22/12 11:23:20.904 AM com.apple.SecurityServer: Failed to authorize right 'system.install.app-store-software' by client '/System/Library/PrivateFrameworks/PackageKit.framework/Versions/A/Resources/installd' [11503] for authorization created by '/usr/sbin/installer' [11468]
5/22/12 11:23:20.920 AM installd: PackageKit: ----- Begin install -----
5/22/12 11:23:38.740 AM installd: Installed "Sophos Anti-Virus" ()
5/22/12 11:23:38.812 AM installd: PackageKit: ----- End install -----
5/22/12 11:23:38.982 AM installer: Removing temporary directory "/var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/T//Install.114686qdrnd"
5/22/12 11:23:38.986 AM installer: Finalize disk "Macintosh HD"
5/22/12 11:23:38.987 AM installer: Notifying system of updated components
5/22/12 11:23:38.987 AM installer: **** Summary Information ****
5/22/12 11:23:38.987 AM installer:   Operation      Elapsed time
5/22/12 11:23:38.987 AM installer: -----------------------------
5/22/12 11:23:38.987 AM installer:        zero      0.01 seconds
5/22/12 11:23:38.989 AM installer:        disk      0.01 seconds
5/22/12 11:23:38.989 AM installer:     install      18.56 seconds
5/22/12 11:23:38.989 AM installer:     -total-      18.58 seconds

Every Two Hours:

5/21/12 7:11:31.989 PM com.apple.SecurityServer: Failed to authorize right 'system.install.app-store-software' by client '/System/Library/PrivateFrameworks/PackageKit.framework/Versions/A/Resources/installd' [575] for authorization created by '/usr/sbin/installer' [539]
5/21/12 7:11:31.992 PM installd: PackageKit: ----- Begin install -----
5/21/12 7:11:45.600 PM installd: Installed "Sophos Anti-Virus" ()
5/21/12 7:11:45.683 PM installd: PackageKit: ----- End install -----
5/21/12 9:11:57.549 PM com.apple.SecurityServer: Failed to authorize right 'system.install.app-store-software' by client '/System/Library/PrivateFrameworks/PackageKit.framework/Versions/A/Resources/installd' [1919] for authorization created by '/usr/sbin/installer' [1886]
5/21/12 9:11:57.553 PM installd: PackageKit: ----- Begin install -----
5/21/12 9:12:14.432 PM installd: Installed "Sophos Anti-Virus" ()
5/21/12 9:12:14.493 PM installd: PackageKit: ----- End install -----
5/21/12 11:12:22.469 PM com.apple.SecurityServer: Failed to authorize right 'system.install.app-store-software' by client '/System/Library/PrivateFrameworks/PackageKit.framework/Versions/A/Resources/installd' [3311] for authorization created by '/usr/sbin/installer' [3276]
5/21/12 11:12:22.472 PM installd: PackageKit: ----- Begin install -----
5/21/12 11:12:35.372 PM installd: Installed "Sophos Anti-Virus" ()
5/21/12 11:12:35.441 PM installd: PackageKit: ----- End install -----