XsaraOwner1

Hey everyone ;) I've got a Xsara W Reg. It's been fine up to now, but today it won't start. I can bump start it with no problem at all, and it will then run until I take the key out. Once I do this I'm back to square one and I can't start the car - It doesn't even seem like it's trying to start as it makes no noise at all. After attempting to start the car, the whole thing seems to 'reset' and makes a lot of whirring and clicking noises. As an interesting sidenote, if I turn the key to the on position, I can use the electric windows and radio etc. Indicators will work, but once I turn on the headlights, the electrics will just die. I hope I've described this problem ok - can anyone help? :) Thanks