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Windows 8 features MS's version of Apple-style walled garden app infrastructure, which is in turn protected by hardware TPM. Windows 7 can be installed without this hardware support, but will utilize it when available (by securing signed drivers). Windows 8 doesn't require TPM (yet), Windows 9 has been in development since before the release of 7. TPM support was introduced as a core component in Vista, iirc.

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