Lets take an example of Actuate Report Server Installed on single server Environment and some reason has not been properly installed and then you decide to uninstall and re-install the Actuate report Server.
After succesfully un-installing the application using the Uninstall folder under the root of the D:\sea_thirdparty_770** and re-start the server to clean the orphan files or folders left by un-installation process.
After launching the installation and when you get to the point of “Click Next to Install Siebel Report Server” to this directory…., it says that there already another instance of the Siebel Report Server running on the location
D:\Sea_thirdparty_770 OR choose a “NEW INSTANCE to Install” – you would scratch you head 🙁 and go to check the drive then the registry to see if any instance is running and after wating almost couple of hours( pulling out hair 🙂 ) you give up and think what to do next as Uninstallation would have doen the work
Then you will try to check in “Add/Remove” there also you will not find any reference to Actuate and then start to think that all these years of exp in siebel has not helped you and start to plan next skill upgrade 🙂 … well dont go that far… Unistalling thru the folder under the root does not always do the work 100%.I would use “Add/remove” to uninstall the Application rather than the uninstall folder.
Let me got the cause of this issue:
Under C:\Windows there is a file called “vpd.properties” file this file contains all information of the siebel and its associated applications installed and removing that values of “D:\sea_thirdparty_770” will let you do the installtion.
So to sum up, after every unistallation please check for this file and if you find one, rename it before you start fresh installtion.