BMW 320D 2005 - I bought earlier this week, it.

BMW 320D 2005 - I bought earlier this week, it had been sitting up in a garage for 3-5 weeks previous. Jumped it while leaving the yard and drove home ok for about 10 miles.

Next morning woke @ 5am due to the alarm going off! Disconnected the battery and left it until later that evening, tried to start again, dead as a doe doe. Jumped the car and ran fine drove approx 70 miles and thought this would charge the battery.

Next morning up early to go to work, car wont start again, try to jump as no joy, wont even start now. Engine managment light comes on and when trying to test fuses, each and everyone are blowing :(

At the end of my tether! Where do I go from here! Help!