remove all drives from the pc , and plug the one with windows installed into another pc . If it has important data on it , backup that data . Then delete all partitions in drive manager and reformat it . Plug it back into the other PC , fresh install windows and then add the other drives <| sep |> I dont mind the sound barrier being brokenWhat you ' re missing here is that the shape and design of most pellets causes them to become unstable when they get near at over the speed of sound . They become wildly inaccurate . What good is 1200 fps when you can ' t hit anything ? 850 fps is ideal for a . 22 springer . 177 too ! . It ' ll smack the waddin ' out of your target at whatever range you ' ll be able to shoot at reasonably .