Sites not starting

I recently rebooted my machine my company's SBS2003 box and when it started the IIS sites were not started. i tried to manually start them and got the following dialogue box error: "The process cannot access the file because it is being used by another process"

This only happened to websites on port 80. If i change the port number to something else, they work. I then checked the event log and found two entries in the system log relating to this. I will paste them below:


Event Type: Error
Event Source: HTTP
Event Category: None
Event ID: 15005
Date: 22/01/2004
Time: 12:18:15
User: N/A
Computer: DTGSBS
Description:
Unable to bind to the underlying transport for 80.176.247.186:80. The IP Listen-Only list may contain a reference to an interface which may not exist on this machine. The data field contains the error number.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 00 00 04 00 02 00 52 00 ......R.
0008: 00 00 00 00 9d 3a 00 c0 ....:.À
0010: 00 00 00 00 00 00 00 00 ........
0018: 00 00 00 00 00 00 00 00 ........
0020: 00 00 00 00 00 00 00 00 ........
0028: 43 00 00 c0 C..À

-------------------------------------------------------------------------------------------------------

Event Type: Error
Event Source: W3SVC
Event Category: None
Event ID: 1004
Date: 22/01/2004
Time: 12:18:15
User: N/A
Computer: DTGSBS
Description:
Cannot register the URL prefix 'http://members.dtg.org.uk:80:80.176.247.186/_layouts/' for site '2115318712'. The site has been deactivated. The data field contains the error number.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 20 00 07 80 ..€