Yours is not the first 190E I've seen with the driver's side front power window not operating, so I don't know what is classically the failure mode for those models...
...I lost both rears within a year on my 300E, and both were related to window track failures...both motors were functional. The cables unspooled and seized up (which may be why your motors are not turning in your case). I would assume that the same motors are supplied with the 190E, and therefore I would lean towards mechanical and not electrical failure.
Few individual replacement parts exist for the regulator, so the other option is replacement of the entire assembly (around $140 for the rears, a bit more for the fronts). It is a DIY job, even for a novice, and would take an hour or two (depending on the difficulty of panel removal)...
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car