Hi Peter,
Open Processing PDE and go to the Examples menu, and select a basic 2D example – for example, something that draws a circle or lines. You can also cut-paste simple examples from the online reference at processing.org/reference – the entry for line() or text() etc.
This is a simple check to see if your problem is 3D-specific or if your entire installation is not working.
I would definitely suggest using your Windows 10 machine when available – I’m not using Windows XP right now, but XP may not be well supported or tested for new Processing releases.