5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
It doesn't necessarily need a new regulator. Mine came off of the tracks at one point but all it needed was to be reinserted into the 'push-button' track supports (on my E34). Not quite sure of the E39 models, though.
If you feel comfortable enough taking your door panels off, try finding out if anything looks misplaced in there.
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