If you just need XP for a specific legacy app, you don't need a key at all. Microsoft released a free "Windows XP Mode" for Windows 7 users, which is essentially a fully licensed virtual hard drive.
: This key is a relic of the early 2000s internet. It might help you boot an old hobby PC or VM, but it is not a legitimate or secure way windows xp product key k2kb2 upd
While less famous than FCKGW, the K2KB2 key served a similar purpose for users attempting to install SP2-integrated versions of the OS without a retail license. Does it work today? If you just need XP for a specific