如何检测VC运行库是否安装

在注册表里搜索指定的键值是否存在(即{}内的代码)：

Visual?C++?2005?Redistributable?Package?(x86)?-?{A49F249F-0C91-497F-86DF-B2585E8E76B7}

Visual?C++?2005?Redistributable?Package?(x64)?-?{6E8E85E8-CE4B-4FF5-91F7-04999C9FAE6A}

Visual?C++?2005?Redistributable?Package?(ia64)?-?{03ED71EA-F531-4927-AABD-1C31BCE8E187}

Visual?C++?2005?SP1?runtime?files

Visual?C++?2005?SP1?Redistributable?Package?(x86)?-?{7299052B-02A4-4627-81F2-1818DA5D550D}

Visual?C++?2005?SP1?Redistributable?Package?(x64)?-?{071C9B48-7C32-4621-A0AC-3F809523288F}

Visual?C++?2005?SP1?Redistributable?Package?(ia64)?-?{0F8FB34E-675E-42ED-850B-29D98C2ECE08}

Visual?C++?2005?SP1?ATL?Security?Update?runtime?files

Visual?C++?2005?SP1?ATL?Security?Update?Redistributable?Package?(x86)?-?{837B34E3-7C30-493C-8F6A-2B0F04E2912C}

Visual?C++?2005?SP1?ATL?Security?Update?Redistributable?Package?(x64)?-?{6CE5BAE9-D3CA-4B99-891A-1DC6C118A5FC}

Visual?C++?2005?SP1?ATL?Security?Update?Redistributable?Package?(ia64)?-?{85025851-A784-46D8-950D-05CB3CA43A13}

Visual?C++?2008?runtime?files

*?VC?9.0?(x86)?-?{FF66E9F6-83E7-3A3E-AF14-8DE9A809A6A4}?

*?VC?9.0?(x64)?-?{350AA351-21FA-3270-8B7A-835434E766AD}

*?VC?9.0?(ia64)?-?{2B547B43-DB50-3139-9EBE-37D419E0F5FA}?

Visual?C++?2008?SP1?runtime?files

*?VC?9.0?SP1?(x86)?-?{9A25302D-30C0-39D9-BD6F-21E6EC160475}

*?VC?9.0?SP1?(x64)?-?{8220EEFE-38CD-377E-8595-13398D740ACE}

*?VC?9.0?SP1?(ia64)?-?{5827ECE1-AEB0-328E-B813-6FC68622C1F9}

Visual?C++?2008?SP1?ATL?Security?Update?runtime?files

*?VC?9.0?SP1?ATL?(x86)?-?{1F1C2DFC-2D24-3E06-BCB8-725134ADF989}

*?VC?9.0?SP1?ATL?(x64)?-?{4B6C7001-C7D6-3710-913E-5BC23FCE91E6}

*?VC?9.0?SP1?ATL?(ia64)?-?{977AD349-C2A8-39DD-9273-285C08987C7B}

如果存在，表示安装了，如果不存在，就没有安装。