Power windows fail when engine is running

[VT_Cruiser]

Hi guys, hope you maybe able to answer something that is strange with a VT Series II SS commodore is have just purchased. I love the car, but the power windows fail when i am driving around. When the engine is off and accessories turned on the windows (all 4) work perfect, however start the engine and most of the time they will not operate..... any ideas? I have heard maybe the module in the dash could cause this error... whatever that is :O/

Cheers
Brendon

[VT_Cruiser]

Had a few auto elecs look at it and to be honest they are all scratching their heads saying that it must be the bcm.... I can get a new one from holden which would cost HUGE, then new fitting, reprogramming and new key stems... Does this sound right? If it is a loose connection on a BCM, can it be repaired or is it a solid state units that is pretty much a chuck away job?