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Still leaving operating system on eg; vista

What exactly do you mean when you say wiped, but leaving the operating system in place? do you wanna delete temporary files and other unnecessary files from your computer? ccleaner is a free program that can not only delete temporary files from all kinds of programs and the windows operating system, but also clear the registry and remove unnecessary programs. you can also change the mode of cleaning from normal to secure cleaning (up to nsa--7 times). this program can be downloaded from http://www.ccleaner.com/. if you wanna reinstall windows vista, run put the vista cd in your drive and restart your computer. you can reinstall it directly from the cd (but be sure to backup your files first!). if you wanna wipe the free space on your system, i recommend using the free program eraser. it can be found at: http://sourceforge.net/projects/eraser/ have i answered your question?