IIS stopped to work after I turn it ON, OFF and ON again

This is the second time it happens in the last few days. The other time I 'solved' the problem by restoring my whole Windows partition from a backup image file as I couldn't figure out any other way. Anyway, if it helps, I see a pattern here because the problem happened exactly the same way both times after I turn IIS on, off and on again.

I first turned IIS on, rebooted my computer and everything was fine with IIS working normally. I made a few tests, turned IIS off again and used my computer for a few days.

Today I turned IIS back on again and when I tried to use it I noticed that it was ruined again. These are the issues I ran into:

1) I cannot reach localhost anymore from my browser. Now it says 'This site can’t be reached - localhost refused to connect.' and throws the 'ERR_CONNECTION_REFUSED' error.

2) The IIS Manager won't show up in the 'Administrative Tools' list anymore, however I still can open it by typing 'inetmgr' in the search box.

3) On the IIS Manager there is not any site under the folder 'Sites'. The first time I turned IIS on there WAS a site there (the default one). Anyway, then I right-clicked it and choose 'add a website'. It opened the form but regardless I fill in all the fields the OK button remained greyed out.

The funny part is that the application pool field appear blank as I think it should have 'DefaultAppPool' there. Also the binding type also appear blank as I think it should have at least the 'http' and 'https' options.

Any clue on how to make it work other than restoring my Windows partition?

Thanks!