I currently have three laptops and a desktop at home and I think its time to do some reformatting with them. As for one of the laptop, I don't think I still have the original Windows XP installation CD with me. Bought this laptop about 2.5 years ago. (HP) In fact same goes, for the rest. The only ones that I've got the CD in hand now is my desktop and the most recent laptop.
What if I reformat and not do any installation? How important is the CD? Can I just do a clean up without removing the already-verified Windows? (All my Windows are 'Genuinely Verified'.)