The process cannot access the file because it is being used by another process. (Exception from HRESULT: 0x80070020) – IIS 7 – Internet Information Se

In IIS7 I was trying to start my Default Web Site and was getting the following error screen.

The process cannot access the file because it is being used by another process. (Exception from HRESULT: 0x80070020)

A quick Google search turned up the following Microsoft Support Topic. Ok. Lets take a look at netstat and see what might be causing problems. Open a command prompt ([Windows Key + R] and enter cmd) and enter the command. After running netstat -ano, I noticed that there was indeed another process (with a process id of 796) accessing port 80. (You can enter netstat /? to see what the –ano flags are doing.)

The offending process that is using port 80 has a process id of 796. Now, how to find out what that process 796 is?
Using the tasklist command will show a list of all processes running in windows. You can use the /fi flags to filter the results. In this case I’m using a filter that will only show processes with a PID that equals 796. tasklist /fi “PID eq 796”

The process with process id is Skype. Makes sense that it would be using port 80. I promptly closed down Skype and was then able to start my Default Web Site in IIS Manager. Hope this helps someone.