Most likely a fuse or relay. Check your owners manual for where it would be located. if its a fuse make sure its not broken. If its a relay try with a different relay if it still doesn't work your motors could have burned out although unlikely. Do the rear windows still work? If you don't have an owners manual there normally a fuse box under the steering wheel or under the hood normally near the drivers side.
I hope this helps and good luck fixing!