Wiping a hard drive, except windows.?

Question

I've got a computer from work which I'm wiping completely clean (with the proper program) to remove any shred of any files on it. The boss doesn't want the computer and I know a family that needs one so I'm trying to wipe the hard drive, but leave windows on it because we no longer have the Windows CD. I can exclude certain folders from the destruction so should I try to exclude windows files (I don't know how to do this, I'd assume protect the windows folder amongst other things.) Or can I make a boot disk of some sort to reload windows without the CD key? Of course I want to do this legally so no pirating please.

Aiya. Forgot to mention, it's Windows XP Pro.

If absolutely necessary I can simply manually delete everything on the PC, then use the option to "clean unused space" which wipes over unindexed parts of the hard drive with junk files over and over and over again until the original files are unreadable.

Answer 1

You'll need power desk pro by vcom ( or similar)and windows xp repair utilities for desk top from microsoft . Power desk can low level format files and folders where they reside and partitions other than where your windows operating system resides. Be aware that when you low level format individual files or folders where they reside you must run chkdsk each time after you do to fix your registry path and sequential format. Nothing will work if you don't

Answer 2

Best you can do is delete all the files that pertain to work.
Even that will not really delete them, they could be recovered with the right software.

Answer 3

Imposible to doit legally without spending some money.