Cannot install KB2737155 (64-bit)

Hi all,

A little background....  A few of us running Win7 x64 carried out manual installs of Lync 2010 client.  Later, a few weeks down the line we deployed Lync to the rest of the organisation (all Win7 x86) using a GPO that pushed out the Lync MSI.  This worked fine and all the machines received it ok.

I am wondering if this GPO might have applied to our x64 machines and screwed something up?  Lync works fine, it's just that we can't install this update.

Running Windows 7 x64.  When I try to install I get:

The Installer has encountered an unexpected error installing this package.  This may indicate a problem with this package.  The error code is 2727.

In eventvwr I get:

Windows Installer reconfigured the product. Product Name: Microsoft Lync 2010. Product Version: 4.0.7577.4356. Product Language: 1033. Manufacturer: Microsoft Corporation. Reconfiguration success or error status: 1603.

Log file show:

The installer has encountered an unexpected error installing this package. This may indicate a problem with this package. The error code is 2727. The arguments are: INSTALLDIRECTORY64, ,

I used msiexec to create a verbose log file and the bold part stands out:

MSI (c) (F0:FC) [09:36:29:537]: Note: 1: 2262 2: Registry 3: -2147287038
MSI (c) (F0:FC) [09:36:29:537]: Transforming table Registry.

MSI (c) (F0:FC) [09:36:29:537]: Transforming table Registry.

MSI (c) (F0:FC) [09:36:29:537]: Note: 1: 2262 2: Registry 3: -2147287038
MSI (c) (F0:FC) [09:36:29:537]: Transforming table Registry.

MSI (c) (F0:FC) [09:36:29:538]: Transforming table Registry.

MSI (c) (F0:FC) [09:36:29:538]: Note: 1: 2262 2: Registry 3: -2147287038
MSI (c) (F0:FC) [09:36:29:538]: Note: 1: 2205 2:  3: Class
MSI (c) (F0:FC) [09:36:29:538]: Note: 1: 2262 2: Extension 3: -2147287038
MSI (c) (F0:FC) [09:36:29:538]: Note: 1: 2205 2:  3: TypeLib
Action ended 09:36:29: FileCost. Return value 1.
MSI (c) (F0:FC) [09:36:29:538]: Doing action: CostFinalize
Action 09:36:29: CostFinalize. Computing space requirements
Action start 09:36:29: CostFinalize.
MSI (c) (F0:FC) [09:36:29:540]: PROPERTY CHANGE: Adding OutOfDiskSpace property. Its value is '0'.
MSI (c) (F0:FC) [09:36:29:540]: PROPERTY CHANGE: Adding OutOfNoRbDiskSpace property. Its value is '0'.
MSI (c) (F0:FC) [09:36:29:540]: PROPERTY CHANGE: Adding PrimaryVolumeSpaceAvailable property. Its value is '0'.
MSI (c) (F0:FC) [09:36:29:540]: PROPERTY CHANGE: Adding PrimaryVolumeSpaceRequired property. Its value is '0'.
MSI (c) (F0:FC) [09:36:29:540]: PROPERTY CHANGE: Adding PrimaryVolumeSpaceRemaining property. Its value is '0'.
MSI (c) (F0:FC) [09:36:29:541]: Note: 1: 2205 2:  3: MsiAssembly
MSI (c) (F0:FC) [09:36:29:541]: Note: 1: 2228 2:  3: MsiAssembly 4:  SELECT `MsiAssembly`.`Attributes`, `MsiAssembly`.`File_Application`, `MsiAssembly`.`File_Manifest`,  `Component`.`KeyPath` FROM `MsiAssembly`, `Component` WHERE  `MsiAssembly`.`Component_` = `Component`.`Component` AND `MsiAssembly`.`Component_` = ?
MSI (c) (F0:FC) [09:36:29:541]: PROPERTY CHANGE: Modifying OCSETUPDIR property. Its current value is 'C:\Program Files (x86)\OCSetup\'. Its new value: 'C:\Program Files (x86)\OCSetup'.
MSI (c) (F0:FC) [09:36:29:541]: PROPERTY CHANGE: Adding FIREFOXPLUGINSDIRECTORY property. Its value is 'C:\Program Files (x86)\Mozilla Firefox\plugins'.
MSI (c) (F0:FC) [09:36:29:543]: PROPERTY CHANGE: Adding DIR_Media property. Its value is 'C:\Program Files (x86)\Microsoft Lync\Media'.
MSI (c) (F0:FC) [09:36:29:543]: PROPERTY CHANGE: Adding INSTALLDIRECTORY property. Its value is 'C:\Program Files (x86)\Microsoft Lync'.
MSI (c) (F0:FC) [09:36:29:548]: PROPERTY CHANGE: Adding DIR_UCCAPIRES property. Its value is 'C:\Program Files (x86)\Microsoft Lync\MUI\0409'.
MSI (c) (F0:FC) [09:36:29:550]: PROPERTY CHANGE: Adding PlaybackLocation property. Its value is 'C:\Program Files (x86)\Microsoft Lync\Playback'.
MSI (c) (F0:FC) [09:36:29:550]: PROPERTY CHANGE: Adding ClientBinLocation property. Its value is 'C:\Program Files (x86)\Microsoft Lync\Playback\ClientBin'.
MSI (c) (F0:FC) [09:36:29:552]: PROPERTY CHANGE: Adding Playback_Resource_Location property. Its value is 'C:\Program Files (x86)\Microsoft Lync\Playback\ClientBin\en-us'.
MSI (c) (F0:FC) [09:36:29:553]: PROPERTY CHANGE: Adding DIR_UCCPTarget property. Its value is 'C:\Program Files (x86)\Microsoft Lync'.
MSI (c) (F0:FC) [09:36:29:555]: PROPERTY CHANGE: Adding INSTALLDIRECTORY64 property. Its value is 'C:\Program Files\Microsoft Lync'.
MSI (c) (F0:FC) [09:36:29:555]: Note: 1: 2727 2: INSTALLDIRECTORY64
DEBUG: Error 2727:  The directory entry 'INSTALLDIRECTORY64' does not exist in the Directory table
The installer has encountered an unexpected error installing this package. This may indicate a problem with this package. The error code is 2727. The arguments are: INSTALLDIRECTORY64, ,
MSI (c) (F0:FC) [09:36:33:493]: Product: Microsoft Lync 2010 -- The installer has encountered an unexpected error installing this package. This may indicate a problem with this package. The error code is 2727. The arguments are: INSTALLDIRECTORY64, , 

Action ended 09:36:33: CostFinalize. Return value 3.
MSI (c) (F0:FC) [09:36:33:495]: Doing action: FatalError
Action 09:36:33: FatalError.
Action start 09:36:33: FatalError.
Action 09:36:33: FatalError. Dialog created
MSI (c) (F0:3C) [09:36:33:506]: Note: 1: 2731 2: 0
Action ended 09:36:36: FatalError. Return value 2.
Action ended 09:36:36: INSTALL. Return value 3.
Property(C): InstallMode = Complete
Property(C): UpgradeCode = {A859ED42-A2CC-4F95-B084-2D8383B566A7}
Property(C): VERSIONIE = 8.0.7601.17514
Property(C): BROWSER = "C:\Program Files (x86)\Internet Explorer\iexplore.exe" -nohome
Property(C): IEXPLORER_EXE = C:\Program Files (x86)\Internet Explorer\iexplore.exe
Property(C): MSXML60 = C:\Windows\SysWOW64\msxml6.dll