Just a question. Can I run the system file checker tool in vista? If so, would I need a genuine Microsoft Vista operating system disk in order to replace any missing or corrupted files should any be found corrupted or missing? I do not have a vista disk. I know in XP you had to use the Microsoft Disk in order to replace missing or corrupted files. I think I have read some where that the files can be found in a compressed area of the hard drive.