Similar problem + unbalancing???

My machine will not complete the spin cycle properly. All the clothes end up on one side like it is unbalanced & the machine comes to a grinding halt (loud & scary) with a bad burning rubber or electrical smell & thin smoke fills the laundry room. It happens on every load until it stops so please do not tell me to re-balance the clothes as been there done that many times!!! I can't run it at all now as this is obviously not good for the machine :( Can anyone help with what to look for first in an attempt to get new parts or does anyone have any advise at all? Please help!!! Megs