未能启动 aspnet_wp.exe，原因是配置文件的 processModel 节中提供的用户名和/或密码无效。

修改 C:/WINDOWS/microsoft.net/framework/vxxxxx(你的.net framework版本号)/config/machine.config寻找processModel属性，修改成有用的username,password 默认设置： <processModel

   enable="true" 
timeout="Infinite" 
idleTimeout="Infinite" 
shutdownTimeout="00:00:05" 
requestLimit="Infinite" 
requestQueueLimit="5000" 
restartQueueLimit="10" 
memoryLimit="60" 
webGarden="false" 
cpuMask="0xffffffff" 
userName="machine" 
password="AutoGenerate" 
logLevel="Errors" 
clientConnectedCheck="00:00:05" 
comAuthenticationLevel="Connect" 
comImpersonationLevel="Impersonate" 
responseDeadlockInterval="00:03:00" 
responseRestartDeadlockInterval="00:03:00" 
autoConfig="true" 
maxWorkerThreads="20" 
maxIoThreads="20" 
minWorkerThreads="1" 
minIoThreads="1" 
serverErrorMessageFile="" 
pingFrequency="Infinite" 
pingTimeout="Infinite" 
asyncOption="20" 
maxAppDomains="2000" 
/>

微软官方在线文档： http://msdn.microsoft.com/zh-cn/library/7w2sway1(VS.80).aspx