If you are having problems reinstalling Microsoft Office 2013 on your Windows 8 computer, some leftover registry keys may be the problem. Both click-to-run installations -- Office 365, for example -- and MSI installations leave traces in the registry. Under normal circumstances, these registry keys are deleted by the uninstaller. If some of the keys remain and prevent you from installing Office, you can remove them using the Registry Editor. Modifying the Windows registry is a dangerous operation; deleting the wrong keys can cause some programs to malfunction or even crash the entire operating system. Proceed with caution.
Press "Windows-R" to display the Run dialog, type "regedit.exe" into the "Run" field and press "Enter" to launch the Registry Editor utility. This procedure works in both Windows 8.1 and 7.
Delete registry keys created by a click-to-run installation by double-clicking the "HKEY_LOCAL_MACHINE" key to expand it, expanding the "SOFTWARE" key and then expanding the "Microsoft" key. Select the "AppVISV" subkey, press "Delete" and then click "Yes" to confirm and delete the subkey. Expand the "Office" key, expand the "15.0" key and then delete the "ClickToRun" subkey. Return to the "Windows" key "and then expand the "CurrentVersion\Uninstall" key. Delete the "Microsoft Office
Remove registry keys created by the MSI installation of Office 2013 by deleting the "HKEY_CURRENT_USER\Software\Microsoft\Office\15.0" and "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\15.0" subkeys. Expand the "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\Delivery\SourceEngine\Downloads" key and then delete the "0FF1CE}-" subkey. Expand the "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion" key. Expand the "Uninstall" key and then delete the "0FF1CE" subkey. Expand the "Installer\Upgrade Codes" key and then delete the "_F01FEC" key. Expand the "Installer\UserData\S-1-5-18\Products" key and then delete the "_F01FEC" key. Expand the "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services" key and delete the "ose" subkey, if it is present. Minimize the keys you expanded so far, if the list of keys is too long. Expand the "HKEY_CLASSES_ROOT\Installer" key. Delete the "_F01FEC" subkeys from the the "Features," "Products" and "UpgradeCodes" keys. Expand the "HKEY_CLASSES_ROOT\Installer\Win32Assemblies" key and then delete the "_Office15*" subkey.
Remove registry entries common to both click-to-run and MSI installations by expanding the "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall" key. Select each subkey and then look in the right pane to view all its values. When you locate a value named "UninstallString" with a value of "File_Name Path\Office Setup Controller\Setup.exe Path," delete it by selecting it and pressing "Delete." File_Name represents the name of the installation program and Path is the actual path to the program. Delete all values that have the specified name and data.
If you are running a 64-bit version of Windows 8.1 or 7, delete the "15.0" subkey from the "HKEY_CURRENT_USER\Software\Microsoft\Office" key. Expand the "HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Office" key and then delete the "15.0" subkey. Delete the "0FF1CE}-" subkey from the "HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Office\Delivery\SourceEngine\Downloads" and the "0FF1CE" subkey from the "HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall" key. Expand the "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services" key and then delete the "ose" subkey. Expand the "HKEY_CLASSES_ROOT\Installer" key and then delete the "_F01FEC" subkeys from the "Features," "Products" and "UpgradeCodes" keys. Also delete the "_Office15*" subkey from the "UpgradeCodes" key. Don't forget to delete the registry entries common to both click-to-run and MSI installations.
The asterisk character in various registry keys and subkeys represents one or more random characters. Ensure the key or subkey contains the rest of the characters -- 0FF1CE}- or F01FEC, for example -- before you delete it.
You can back up any registry key by right-clicking it, selecting "Export," typing a name for the backup and then clicking "Save." Saved keys can be restored by double-clicking them.
To completely uninstall Office 2013 from your system automatically, open the "How to uninstall Office 2013 or Office 365" page (link in Resources) and click the "Microsoft Fix It" button. Save the utility on your hard drive and then run it. Follow the instructions on your screen to completely remove Office 2013.
Deleting keys and values from the registry is a dangerous operation. If you delete the wrong entries, you may cause programs to malfunction or even crash the Windows 8.1 or 7 OS. Don't delete registry keys and subkeys unless you are certain they are related to Office 2013.