Israr, yes, all installed off the same install file.
To run the elevated command prompt
1. Goto Start | All Programs | Accessories and right click on 'Command Prompt' and select 'Run as administrator'
2. In the command prompt, you will now need to navigate to the folder where you have saved 'Outsystems-AgilePlatform-Full-Setup.exe'
3. Now simply type 'Outsystems-AgilePlatform-Full-Setup.exe' (without inverted commas) and it should work!
This sort of thing used to be a problem in 5.1....
The very last update - Always re-boot the machine after install, but before running SCINSTALL.bat has not failed me to date.