Cannot create a Web Interface site with a particular name (74721)

When attempting to create a Web Interface, a website with a specific name cannot be created, but other websites with different names can be created,

This can be caused by the website still existing in an IIS configuration file.

1) Check the C:\Windows\System32\inetsrv\config\applicationHost.config file to see if it contains something like the following which  relates to the virtual directory of the problem website:

<application path="/ARServerAdmin/Interface" applicationPool="ARServerAppPool">
<virtualDirectory path="/" physicalPath="C:\Program Files\Quest Software\ActiveRoles Server\Web Interface 6.7\6.7.0\Public\Interfaces\ARServerAdmin\" />

</application>

AND/OR

<location path="/ARServerAdmin/Interface" applicationPool="ARServerAppPool">
<virtualDirectory path="/" physicalPath="C:\Program Files\Quest Software\ActiveRoles Server\Web Interface 6.7\6.7.0\Public\Interfaces\ARServerAdmin\" />
</location>

3) In an elevated command prompt, run iisreset