My Dell RT7D40 won't sync with my computer.

Blue tooth is notorious for not working. Your best bet for a worry-free life with your computer, is do not use wireless kbd or mouse. sincerely, they are all hype, and no real benefits come from their use. Youd be better off using USB extension cables to reach into those odd places rather than spending hours and hours of time trying to get something to work, only to discover that as soon as windows updates itself, it has failed and, (once again) you have no kb or ms control and the computer is just sitting there waiting on you to do something, but you cant. wireless kb and mice are a pain, and they eat batteries like pac man eats dots.