|Your 2 year old has reprogrammed your desktop. He is a fast learner!!!!|
Check you recycle bin he may have accidentally deleted them. If they are there do a restore from recycle bin.
Undo might still be possible if you have not done much.Try that.
The other possibility is he has somehow accidentally moved it. You need to look around to see where he might have moved it/them to.
☺ When everything else fails, read the instructions.