Office 2010 Silent install - Error 1618

Hi,

I'm trying to create a silent install for Office 2010 (currently just using a config.xml to get it working) but it keeps hanging with the error 'The installation appears to have failed because another MSI operation was taking palce. Retrying....'

Nothing else is installing (I've tried it several times) if I launch task manager and kill one of the msiexe process the install continues and finishes correctly.

My Config file looks like this:

- <Configuration Product="ProPlus">
  <Display Level="none" CompletionNotice="no" SuppressModal="yes" AcceptEula="yes" />
  <Logging Type="standard" Path="c:\log\" Template="Microsoft Office Professional Plus Setup(*).txt" />
- <!--  <USERNAME Value="Customer" />
  -->
- <!--  <COMPANYNAME Value="MyCompany" />
  -->
- <!--  <INSTALLLOCATION Value="%programfiles%\Microsoft Office" />
  -->
- <!--  <LIS CACHEACTION="CacheOnly" />
  -->
- <!--  <LIS SOURCELIST="\\server1\share\Office;\\server2\share\Office" />
  -->
- <!--  <DistributionPoint Location="\\server\share\Office" />
  -->
- <!--  <OptionState Id="OptionID" State="absent" Children="force" />
  -->
- <!--  <Setting Id="SETUP_REBOOT" Value="IfNeeded" />
  -->
- <!--  <Command Path="%windir%\system32\msiexec.exe" Args="/i \\server\share\my.msi" QuietArg="/q" ChainPosition="after" Execute="install" />
  -->
  </Configuration>

Does anyone know how to resolve this issue?

Thanks

Nick