Error “A reboot from a previous installation is pending” during Exchange InstallUninstall

Scenario:  When attempting to install/uninstall Exchange, you receive the following error during readiness checks:

“A reboot from a previous installation is pending”

Even after a reboot, it doesn’t clear this error.

Solution:

1. Clear values out of the PendingFileRenameOperations key located at: HKLMSYSTEMCurrentControlSetControlSessionManagerPendingFileRenameOperations
2. You may need to clear out the content of this key as well located at: HKLMSystemControlSet001ControlSessionManager