silverlight tools beta 2 for vs 2008 安装问题
OS：Windows xp
vs:vs 2008 team suit 简体中文
安装文件
微软7月份发布的silverlight tools beta 2 for vs 2008 简体中文版
系统无KB949325更新文件，也没有安装其它版本的的silverlight，即使安装了也应该卸干净了。
现在安装进行到快结束时来一个致命性错误
Action: Performing Action on Exe at d:\45f299bd0931d441a97ac83ee37a\VS_SilverlightTools_Beta2_Setup.exe...
[7/28/2008, 18:34:51] (IronSpigot::ExeInstallerBase::Launch) Launching CreateProcess with command line = d:\45f299bd0931d441a97ac83ee37a\VS_SilverlightTools_Beta2_Setup.exe /q
[7/28/2008, 18:35:8] (IronSpigot::ExeInstallerBase::EnsureExitCodeIsAnMSIErrorCode) Original exit code: d:\45f299bd0931d441a97ac83ee37a\VS_SilverlightTools_Beta2_Setup.exe returned non-MSI error code: 0x1fff - (null)
[7/28/2008, 18:35:8] (IronSpigot::ExeInstallerBase::PerformAction) d:\45f299bd0931d441a97ac83ee37a\VS_SilverlightTools_Beta2_Setup.exe - Exe installer does not provide a log file name
[7/28/2008, 18:35:8] (IronSpigot::ExeInstallerBase::PerformAction) Exe (d:\45f299bd0931d441a97ac83ee37a\VS_SilverlightTools_Beta2_Setup.exe) failed with 0x80070643 - Fatal error during installation. :
[7/28/2008, 18:35:8] (IronSpigot::ExeInstallerBase::PerformAction) PerformOperation on exe returned exit code 1603 (translates to HRESULT = 0x80070643)
[7/28/2008, 18:35:8] Action complete
谁知道这是什么原因，帮帮我啊！我头大现在。HELP
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顶！
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