安装软件时出现Error 1001.InstallUtilLib.dll: Unknown error.提示，导致安装失败，查看了一下，这个dll在Microsoft.Net文件夹中。求解决办法！重装系统不太现实，.Net是4.0的，已经重新安装过，没有解决问题。
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google的，你参考一下
If you got error "Error 1001: installutillib.dll Unknown Error", please install .Net Framework 3.5 for Windows 8 by this way:
"Control Panel" > "Programs and Features" > "Turn Windows features on or off" > Choose ".NET Framework 3.5 (includes .NET 2.0 and 3.0)" > "OK"