Regarding your windows issue, the W210 is a digital car, and the elec accessories. Communicate thru the CAN bus. One defective unit can interrupt comms and shut down all windows, seats, mirrors... Google for more info. To isolate, find the connector buried under the door trim at the A-pillarn then disconnect one at a time, disconnect & reconnect battery, then drive around for a few days to see if the problem recurs. Repeat until you isolate the culprit. Mine was the rt rear window motor, which is common.
If you don't want to do this, have a shop with Xentry diagnose it for a one-and-done. Do not throw parts at it.

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Prost!