Ok, I was wondering if there was anyway that I could make like a master copy of an OS, particularly Windows XP, but also Vista and 7. If this is a lame question please forgive me as I am not the most computer savvy , but I'm looking to have a copy of each of the above mentioned OS's that I can use to trouble shoot my friends and families computers, but I'm afraid I'm going to run into issues with the product keys only being able to be used a limited number of times. Is there anyway around this? Is there a more expensive master copy type disk that you can buy for such a purpose?