wow man. Im sorry to tell you but your screwed. Everythings dead on you now, well not dead but in capable of running when you deleted that value you really screwed things up, the only thing i could recommand doing is editing bio's but yet again you cant because it wont read your keyboard, but it should on a boot up, also did you try a boot up with with the disk in the drivce. If tis doesnt work order a linux distro. If you use direct internet and not Wireless then it will be easy to set up a network. Other then that you'll have to totally try to find a way to pull a format, or buy a new hdd. But keep the second one and make it a slave, so you can format it and use it as a second hdd for windows or w.e, i do that, well did and labled it drive D, and saved all zip's on there so they wouldnt be lost on a reformat.