Follow these steps to perform the un-installation of Argus Insight:
Log on to the Argus Insight Web Server as an Admin user.
Go to Uninstall or change a program by going to Control Panel > Programs > Programs and Features.
Right-click on Argus Insight and select Uninstall, as shown below.
The following screen appears. Select Remove (3rd option) and click Next.
A warning message is displayed: "Do you want to completely remove the selected application and all of its features"?
Select Yes to continue.
The system will uninstall the Argus Insight application and will ask to restart the Argus Insight web server.
Click OK to restart the Argus Insight web server.
Log on to Argus Insight web server as Admin user once it is up again.
Go to the Argus Insight installation directory (Where Insight was installed before un-installation).
Remove the Argus Insight folder completely from this location.
Reset the IIS before starting the installation of Argus Insight again.
Follow the same steps as mentioned above for un-installing Argus Insight from Cognos/Cube server.