i went and got a computer from a guy he said was all fine except the hard drive is bad.. im thinkin ok cool i can just put my hard drive in from my other computer. so i put it in and it tells me "error loading OS" and something about putting in my system disk and hitting enter. the guy gave me a disk he said i might need to put in when i get a new hard drive.. but i thought because my hard drive already runs fine in my computer i could just move it and all my same stuff would pop up i would just need to install the drivers for the video card and all that good stuff.. but instead no i get an error loading operating system. figured i would try and get some responses before i tried puttin in the disk he gave me.. maybe could just be a bad cable??