Exchange 2010 Error- a Reboot from Previous Installation is Pending

This blog illustrate why the Exchange 2010 Error "a Reboot from Previous Installation is Pending comes and how to resolve this error with complete description. It help you to understand the cause of this error and how this error affect the windows registry.

What is Installation Pending error?

An Exchange Server administrator can easily install Exchange Server in the Microsoft Exchange 2010 environment but some time they face an error message "a reboot from previous installation is pending" and abort the Exchange Server installation process. This error is generated by Exchange server Analyzer. The exchange analyzer is use to verify the connectivity and resolve the Exchange topology issues.

In this situation an error message comes with code to reboot the system but after rebooting the system the error would not resolved and installation process fails every time. To overcome from this situation Microsoft developed some analyzing tools that can remove exchange 2010 error, a reboot from previous installation is pending. The Analyzer Software is gathers the configuration information and remotely analyze it.

Exchange Server analyzer tools.

Here I am listing all Exchange server analyzer tools which is developed by Microsoft.

  • Best Practice Analyzer.
  • Trouble Shooting Assistant.
  • Remote connectivity analyzer.

Why the installation Pending error comes?

when an administrator try to install exchange server in exchange 2010 then the analyzer tool checks the system registry if it found any previous application does not successfully installed then it shows an Exchange 2010 error a reboot from previous installation is pending and suggest to reboot the system. If after rebooting exchange error is resolved then you can easily install exchange server otherwise you need to perform some steps. If this error does not resolved, then you will have to restart from following registry key.


To verify that previous installation is pending or not, check the given below registry key.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\PendingFileRenameOperations

If the analyzer tool found any orphaned or corrupted value in the registry then it will show error message on every installation request.

How to Resolve Exchange 2010 error a Reboot from Previous Installation is pending?

Before start changing windows registry key keep one thing in mind that windows registry keep instructions what to do for a particular request. If you change to registry then it may cause to stop working of window so be careful while changing registry. You can resolve exchange error a reboot from previous installation is pending follow the steps given below.

Step 1: - Delete the orphaned PendingFileRenameOperations registry key

  • Go to Registry Editor like Regedit.exe or Regedt32.exe.
  • Locate the following registry key
    HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\
  • Locate Right Navigation Pane, Right-Click on the PendingFileRenameOperation and click on delet
  • Now close the Registry Panel.

Step 2:- Remove an orphaned UpdateExeVolatile registry key value.

  • Open the Registry Editor.
  • Find the HKLM\SOFTWARE\Microsoft\Updates\
  • Go to Right Navigation Panel and click on the UpdateExeVolatile Key.
  • Set the Key Value to 0.
  • Finally close the Registry Editor.


I have tried to put all the aspects that can cause a reboot from previous installation is pending error and discussed two method to resolve the Exchange 2010 Error- a Reboot from Previous Installation is Pending.