Lync Server Install Fails on SQL Express Install

Have run across this issue a few times now and it always take me a while to find to find the registry key that needs to be updated so thought I would port about it.

The issue is that the SQLExpress install fails as the systems thinks there are pending file deletes to happen during a reboot, but even after the reboot you get the same error.

The below is the error that is seen.

The registry key that needs to be updated is under:

HKLM > SYSTEM > ControlSet001 > Control > Session Manager > PendingFileRenameOperations

Just open the entry and delete the contents, close the Lync Deployment Wizard and re-run the Lync Bootstrapper.  All should be good.