Plesk 7.6 update -> PHP5 upgrade?

[mpexx]

Hello.
I've updated Plesk from 7.5 to 7.6.1. (Win32)
Now, i don't know how to reconfigure Plesk to run both PHP4 and PHP5. Only PHP4 is currently installed.
Do I need to perform a clear installation of Plesk 7.6?

Thanks