百度了一大堆没解决问题，竟还要建议重装系统。翻到老外的网站，7个步骤搞定。
现象：
Compiler Error Message: The compiler failed with error code 128.
Server Error in '/' Application.
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Show Detailed Compiler Output:
Compilation Error
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.
Compiler Error Message: The compiler failed with error code 128.
老外的7个步骤：
To do this, follow these steps:
Click Start, click Run, type cmd, and then click OK.
At the command prompt, type control admintools, and then press ENTER.
Double-click Internet Information Services (IIS) Manager.
Expand the computer name, expand Application Pools, right-click the name of the application pool that you want to modify, and then click Properties.
Click the Identity tab.
Click Predefined, and then click Local System.
Click OK.