Windows Process Activation Service Error 2:The system cannot find the file specified

IIS on my development computer stopped working. I just installed the latest update to windows 10 (1803) and now when I try to start the "Windows Process Activation Service" I get an "Windows could not start the Windows Process Activation Service on Local computer. Error 2: The System cannot find the file specified" error. Things I have already tried:

Reinstalled IIS and Windows Process Activation Service, several times
I verified that I do have a "C:\inetpub\temp\appPools" folder

Not sure what to do next.

Solution

I have had this problem twice after a windows update. The issue seems to be, that windows adds an incorrect parameter to the WAS service startup parameters. I fixed the issue using the following steps:

Start regedit (just type it into start)
Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WAS\Parameters
Delete the NanoSetup variable. This variable is preventing WAS from starting
Start the WAS service using task manager or by typing "net start WAS" in Command Prompt
Start the W3SVC service the same way
You can now start your website in IIS again