shtihl

as a sytem builder i know it os legal to use one disc for multiple installations as long as i use the separate keys for the individual machines. if it is a case of damaged media (broken cd), you are in fact legally allowed to use the media from another official MS cd as long as you are using YOUR orignal key so if a friend has the cd that matches your license (Home, Pro, Etc.) then you can use that cd. as far as the neighbors who have the same model laptop, i dont think there is a legal issue as some OEM's can code the key right into the hardware and the media they provide you is just mass produced for that series unit. this media generally can be replaced for around $15 USD