Do you want a clean instll of windows?
If yes you will need the windows disk or a back up disk that came with your laptop, but this may be on a partition on your hard disk.
if you dont have a windows disk you can use one from a freind but it must be the same as the version of windows that is on your pc and you MUST use the key code that is on the bottom of your laptop.
you must now make sure that your cd/dvd drive is set as a boot drive in the BIOS.
Then put the disk in the drive and follow the on screen inatructions.
Phil, November 2009