X and Y axis stalling

All the components are Chinese and I am having trouble finding any model numbers. I'm starting to think that this is a bit beyond my area of expertise. So I have been thinking to replace the whole thing with something like System4C (http://www.diycnc.co.uk/html/cnc_systems.html). This would also give me a parallel port which I don't have at the moment in order to use EMC to it's full potential.

Anyone have any thoughts or recommendations?

I very much appreciate all your help, thank you.

Regards,
Dan

I have the previous version of the board (where the interface board is part of the main board) and it worked well on my old PC but the charge pump doesn't work on the new PC which is only 3.3 volts on the parallel port. The drivers work ok but are a bit noisy (the steppers make a hissing sound in some positions). Other than that it seems good value for money.