windows 7 - How to find what's listening on specific port in Win7?

I'd like to find out what's blocking port 80 on my system. I've found the answer here but... as the result I get "couldn't not determine owner" (or something like that - I use Polish version so exact message is "nie można uzyskać informacji o własności"). Any ideas what could I do?

The result of netstat -a -b -o I get is:

Protocol  Local address          Remote address        State        PID
TCP       0.0.0.0:80             Moby04:0              Listening    4
Nie moľna uzyska† informacji o wasnoci

[edit] I try to run Apache server and verified that IIS is turned off. Also I made sure that Skype is not using this port... Also, I tried to run netstat with Admin privileges without success

Maybe same problem with From PID:4 using Port 80

.. 4. If it is a System Process—PID 4—you need to disable the HTTP.sys driver which is started on demand by another service, such as Windows Remote Management or Print Spooler on Windows 7 or 2008.

There is two ways to disable it but the first one is safer:

1.
  - Go to device manager, select “show hidden devices” from menu/view, go
      to “Non-Plug and Play Driver”/HTTP, double click it to disable it (or
      set it to manual, some services depended on it).

  - Reboot and use netstat -nao | find ":80" to check if 80 is still used.

2.
  - Launch RegEdit.

  - Go to `HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\HTTP`

  - Change the value of "start" to 4, which means disabled.

  - Reboot your computer.

...