These are genuine windows discs. To ensure they will work without a problem you must have the correct licence attached to your PC. On laptops this will be a small label underneath.
They will work on any machine designed for Windows AS LONG AS you have the correct license.
I have the following.......
Windows XP Home
Windows XP Proffesional
Windows XP Media Centre Edition
Windows Vista Home Basic
No returns due to dodgy people who copy things and try to return them !!
Can be posted if you pay by paypal. Post and packing is £3.00