you should never delete things you don't know what they are you could try and do to restore it from the recycle it but if its not there then your screwed it probably wont be there as it is a driver not a document. or you could try downloading the driver for the blue tooth but then that will probably be hard as well try typing in on Google 'blue-tooth drivers' but i doubt that you will be able to find it as its got to be for the model of you pc laptop what ever you have sorry to hear you mucked it up.