If it was something very simple I am sure that someone would post the answer for you.
Unfortunately, the ESP SYSTEM FAULT appears because the ECU shuts it down when various other faults appear. Most, if not all, of these faults are already described in full on the forums and usually serching through them will give you an very good idea of the exact nature of your particular problem.
As there are quite a few reasons for this message to appear, you can't expect others to do this on your behalf really. Posting in the incorrect section doesn't help matters either, but I am sure the modbot will sort that in due course.