Today I was installing Ubuntu and I alocated a 30gb partisian for it and it just hung a 0% and then it said a error occured and it said that my windows partisian was gone. So I let it keep going through the install just so I would have a os. But durring the install it came up with another error and it shutdown. Now when I try to boot up it says I have no os. I won't let me boot up at all. Please help.