From Aylesbury, and looking for some help

[John S]

You don't say how long the fence is but you will need either two support rails for it and one feedscrew, ballscrew actually if you want to keep to 0.1mm accuracy, or better still two ballscrews linked by timing belt to stop the fence crabbing.

Add to this a stepper motor, driver and power supply.
Your XP machine could run a trial version of Mach3 in that you only need MDI input and do not need to run any lines of code. You could even use a custom screen.

[Jonathan]

You don't say how long the fence is but you will need either two support rails for it and one feedscrew, ballscrew actually if you want to keep to 0.1mm accuracy

Surely a trapezoidal screw will have sufficient accuracy. You can get them in similar accuracy grades as ballscrews. C7 grade would be fine. Since speed probably isn't an issue the efficiency of the ballscrew is not an advantage and with this set-up it is very easy to compensate for the greater backlash. Just seems a bit over the top to use a ballscrew to me...