Help Needed

You need to get the car scanned for faults. A full service will not include pad replacement unless you asked them to do it. If you did, then take it back to them.

The window problem is unlikely to be connected with the brake problem and will not be a fuse. If the fuse had blown they wouldn't work at all !

Check in the manual for resetting the windows.

I had an issue with the light coming on just after the pads had been changed. Turned out to be a faulty brake pad sensor and was replaced under warranty. If your's is out of warranty I'd suggest trying to locate the lead from the pads to the sensor and ensure there's no corrosion etc and it's all nice and clean.

However as it's causing you issues with the electrics could well be something entirely different. Good luck!