"HP ALM Platform installation was detected on server. It must be uninstalled before proceeding with configuration"
Customer had installation of the QC 10; but, didn't uninstall.
Tried the installation of ALM 11, got the error,
"HP ALM Platform installation was detected on server. It must be uninstalled before proceeding with configuration".
then, uninstall the ALM 11 & again tried.
To verify that ALM Platform is not installed:
1 From the Start menu, choose Control Panel > Add/Remove Programs.
2 In the program list, check for HP Quality Center (QC 10 or 9.2) or HP Application Lifecycle Management Platform.
3 If either appears in the program list, click Remove, and follow the instructions on your screen.
4. Renamed the vpd.properties file, found under C:\Windows & moved to other place.
5. Restart the Server.
6. Now, try the ALM 11 installation, it will be installed successfully.