Volkswagen Golf IV - Help with Problem - golf-man-2010

I bought a 1999 golf last week from a dealer with a months warranty and found out later that the dealer is dodgy. After 4 days the car broke down and I don't know whether it is a big problem that will remain with the car even after they take it in and fix it because I don't trust the dealer. The ABS light came on and the car started to chuck and then it just cut out altogether. It started with a jump start but it stays chucking for a few minutes and cuts out again with the ABS light coming on. I reckon its a problem with the electronics in the car. The battery is perfect. Also the revs are totally off and the clocks stopped working. Anyone able to tell me exactly what the problem is and what would be the best thing to do?