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I am using Windows 7 Professional. When I am trying to start DefaultAppPool in IIS 7.0, I am getting error -

Service WAS was not found on computer '.'.

Is there any changes in setting need to be done?

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up vote 23 down vote accepted

Well, start off by checking if it is installed.

enter image description here

Control Panel > Programs > Programs and Features > Windows Process Activation Service

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and then run iisreset /restart to make sure both services will run – itsho Jul 16 '13 at 9:16
In case it helps anyone else, I already had these enabled but was still getting the error. I just disabled IIS features, restarted my pc, enabled them again, then restarted again and it solved my issue. – Jerreck Dec 19 '15 at 4:54

Control Panel > Programs > Turn Windows features on or off > Windows Process Activation Service > SELECT ALL > Click OK

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