That's me by the way!
Jane was at work early today so having decided to reinstall and readily armed with coffee and my XP Pro dvd I started...
Install was exactly the same as the previous time, took no longer only this time I partitioned at 30 GB for C.
Booted up and Windows starts...now to install the network, graphics, video, audio drivers for the laptop, all of which are safely backed up on DVD and on my 500 GB Western Digital external hard drive...which is still plugged in to the USB port!
It's not visible in Explorer so I 'safely remove hardware', delete the drivers from within 'System' and reboot. On startup, plug the USB cable back in and the popups tell me it has installed and is ready to go 
Open up Explorer and...no sign of it?
Okay, no worries, where's the DVD, I can reinstall the drivers from that, then go online and browse the forums...where's the DVD? Not in Thailand!!! I must have left it in the UK - merde!
So, go through the usual fault finding and cannot resolve it so now need some expert assistance.
Unfortunately I have no way of connecting to the internet to download the network drivers which I have to have in order to be able to connect to the internet [via my laptop]
I can however, browse via iPhone.
From posts on various sites, it appears that somehow the Master Boot Record has been wiped/trashed and that's why the problem is as is.
Nothing has been installed to, or deleted from the hard drive so I know from past experience that the data is still there, just got to recover it now...
I do have data recovery software just unfortunate that it is with my recovery disks
IN THE UK 
...Tomorrow's just another day.