Hello Bebe,
It may sound obvious but go through all these things first, make sure you have the machine threaded peoperly and that you have put the thread through the tension discs with the presser foot up, make sure you have the needle in the correct way round, your tension should be btween 4 and 6, make sure you have the bobbin in the bobbin case the correct way round, there should be enough tension on the bobbin case to just about pull the thread through. if you have made sure of all this there is no reason why the thread will tangle up, give it a try any problems send me an e-mail below.
Ken
drivewithken@blueyonder.co.uk, September 2007