Thanks guys.
Seems 266.58 is the latest XP compatible release.
I'll try it later today.
The nVidia driver update has messed up the display of some windows, reversed the monitors for no apparent reason and hasn't solved the problem.
I'm already thinking "rollback".
I just can't use SafeZone unless I first un-"attach" the Secondary monitor and then re-"attach" and re-align them afterwards.