i found that,there is two version of windows 7 RTM professional, one is Windows 7 RTM professional x86 and another is windows 7 RTM professional x64....and when i order both them from the site, i had recieved two keys...one is x86 key and another is x64 key. and both them is different from completely. So i want to know: can i install x86 key on my laptop and x64 key on my desktop ? and both them is legal??? sorry for my english!!! and thanks for help!