Server Application Unavailable

Okey, I got a problem with my damn IIS running on my comp. It gave me this error:

Server Application Unavailable.
The web application you are attempting to access on this web server is currently unavailable. Please hit the "Refresh" button in your web browser to retry your request.

Furthermore, the following event is logged in the system application event log:

aspnet_wp.exe could not be launched because the username and/or password supplied in the processModel section of the config file are invalid.
aspnet_wp.exe could not be started.
HRESULT for the failure: 80004005

Then i went and google it for a solution and i found it. Here, hope to share it for IIS users...

Solution:
proceed to processmodel, change the value of userName to system as shown below.

< processModel
....
....
userName="system" *By default, it is set to "machine"
....
/>