我在WIN2003SP2中安装SQL SERVER 2008时出现错误，说程序已经存在，具体内容如下：
错误日志中提示查看：http://go.microsoft.com/fwlink?LinkId=20476&ProdName=Microsoft+SQL+Server&EvtSrc=setup.rll&EvtID=50000&ProdVer=10.0.1600.22
| Details | |
| Product: | SQL Server |
| ID: | 50000 |
| Source: | setup.rll |
| Version: | 10.0 |
| Component: | SQL Server Native Client |
| Message: | A network error occurred while attempting to read from the file '%.*ls'. |
| Explanation | |
|
An attempt was made to install (or update) SQL Server Native Client on a computer where SQL Server Native Client is already installed, and where the existing installation was from an MSI file that was not named sqlncli.msi. |
|
| User Action | |
|
To resolve this error, uninstall the existing version of SQL Server Native Client. To prevent this error, do not install SQL Server Native Client from an MSI file that is not named sqlncli.msi. |
|
解决办法：卸载掉机器里MSXML SP2，再安装就可以了。就这么简单：）
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