Default website not starting because of 80 clash

I have three was sites on a domain controller:
1 - Default Website - CertControl, Enrol etc
2 - WSUS Administration
3 - Microsoft SharePoint Administration
4 - Online (Custom website)

Having an issue with my default website not starting with the following error:
Event Type:      Error
Event Source:      W3SVC
Event Category:      None
Event ID:      1007
Date:            14/04/2006
Time:            8:45:52 p.m.
User:            N/A
Computer:      SVR-01
Description:
Cannot register the URL prefix 'http://*:80/' for site '1218092310'. The necessary network binding may already be in use. 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: b7 00 07 80               ·..€    

It is not being cause by the sharepoint site (different ports) or my online site (on port 80 with host headers). It is being caused by the WSUS Administration site being on port 80. If I stop this site i can start the default site. I dont recall changing any setting it has just started clashing.