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hi, you need to read the fault code label associated with the check engine light. blue smoke is usually indicative of oil burning.if your passat is the turbo you may have a turbo oiling issue.the turbo models also have issues with crankcase/intake plumbing problems. no matter , you need to start with read the fault code .
Your window regulator has failed in a very typical fashion. Other than replacement window regulators are not repairable.Just specify which door it is for and whether it is manual or power windows.