Yes, good advice all. I'd think that spec should be OK for running Pianoteq.
Make sure to also install ASIO4all (or your audio card/unit's ASIO driver package if it exists).
Also good advice there too about freezing tracks @Key Fumbler.
In a DAW definitely it could be good in any case to bounce/freeze instrument tracks. Even on powerful PCs things can get bogged fast depending on how much is going on and how many tracks and all that.
I find freezing or bouncing instrument tracks to audio (even if technically not needed) also helps me just keep going (instead of getting stuck on returning too much to the instruments' MIDI.. kind of 'commit to something' as the spark to herald in new tracks and ideas often also.)
Pianoteq Studio Bundle (Pro plus all instruments) - Kawai MP11 digital piano - Yamaha HS8 monitors