WSUS 3.0 API Remoting Web Service is not working

I was using WSUS 2.0 which I have just upgraded to WSUS 3.0. But after the upgrade I am getting the below error? Can anyone tell me how do I solve this issue? Thanks.

Event Type: Error
Event Source: Windows Server Update Services
Event Category: (9)
Event ID: 12012
Date: 5/24/2007
Time: 7:12:55 AM
User: N/A
Computer: SPIAPPS03
Description:
The API Remoting Web Service is not working.

Have you tried checking out the WSUS and IIS services and see if they are running or not. You can try to scan the server for viruses incase if they are the ones who are disabling Windows Updates and other services.