New
#21
Depending on what you are getting and where you are getting it from, the Windows 7 disks may not be usable on any other system than the HP you have. If you are getting the disk(s) from HP as a downgrade rights option it will likely be a type of recovery disk that will only be valid on the HP system it applies to.
Of course if you are getting a regular OEM disk and Key then that will work on any hardware (but of course can only be used on the hardware it's first used on