Thanks, uncleal.
You're right that XP only recognises 3.5 gig of memory. I think I'll install OFF on Win 7 and see what happens. It's the OS of choice for me and I've only still got XP for some older games and bespoke software that cringe in the corner and won't come out to play when exposed to win 7.
Thank you for your warm welcome.
Looking at some of the threads it looks like a bit of fiddling with the settings might be needed to get smooth running. I'm sure I'll get there in the end:dntknw:
And far be it for me to cause trouble so here's a pic.