I'm a little foggy this a.m., but I believe if during the windows cd boot...it gives u the option of installing or reparing windows....if u choose repair u can type in chkdsk /r once your cursor starts to flash and while windows is running it will repair the corrupted files, it is not a fast process but it does correct the issues. It has been awhile since I've had to do this...any of u older members remember this?....