Download Security Update for Windows Vista Beta 2 and Windows Codename Longhorn Server Beta 2 (Itanium-based Systems) (KB917422) from Official Microsoft Download Center

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Security Update for Windows Vista Beta 2 and Windows Codename Longhorn Server Beta 2 (Itanium-based Systems) (KB917422)

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A security issue has been identified in the Windows Kernel that could allow an attacker to compromise your Windows-based system and gain control over it.