If you provide SharePoint support for your organization or a number of them you will eventually run into the need to un-install SharePoint 2010 from one or more servers. In many of those cases, Office Web Apps will also have been installed.
This was the case in my most recent un-install. I had successfully removed SharePoint 2010 and Office Web Applications from the the server. However; I then got the error “The install progress conflicts with a previously installed Microsoft Office 2010 Server product.” when I tried to install again.
After some digging, I found that the Office Web Applications un-install had left behind some registry keys that were preventing me from installing SharePoint 2010 again. To find and remove the keys, follow these steps:
1. Open the Registry Editor by running regedit command
2. Navigate to HKEY_CLASSES_ROOTInstallerProducts
3. Identify the keys that are related to Microsoft Office Web Apps as seen below:
4. After you identify it is a Web Apps key, right click on they key and choose to delete it - BE SURE NOT TO DELETE ANY OTHER KEY!!
After deleting all of these keys, you should be back in business and able to proceed with you SharePoint implementation. Good Luck!
While this worked for me I make no guarantees. Myself nor IncWorx can be responsible for anything that happens to your system! Make these changes at your own risk! If you are looking for help with your SharePoint deployment, contact me at matt.breski (at) incworx.com!