While working with Internet Information Services (IIS) you can meet several problems. One of the most popular issue is a communique that you can’t start W3SVC. You can find a lot of articles in which people says that you should re-install IIS. But there is another way to fix it:

Cannot start W3SVC service

You need to open Start -> Search programs and files -> and search for services.msc (just copy this, paste in a search window and click Return:

Then in ‘Services’ list you need to find ‘World Wide Web Publishing Service’. Right-click on it and go to Properties:

Find ‘Startup type’ and select it to Automatic:

Apply and click OK button. Now when you try to debug your e.g. asp.net app you will see this alert (‘Unable to start debugging on the web server(…)‘):

The only thing that you should do now is to go to the IIS Manager and start your server. Then try to debug your code. Voila!