I've only recently purchased a custom built computer. Once installing drivers and what not, I began downloading and installing the windows update and a message came up. It said I had a problem with my hard disk and to contact my manufacturer and to back up etc. I ran a SMART test and it came back with a reallocated sector count fail with a value of 1 and a worst of 1, threshold is 36. Is this a major problem? Can I leave it or even fix it? If I were to purchase a new hard disk would i need a new copy of Windows 7?