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==Setting the filesystem permissions==

===Conceptual Overview===
Windows filesystem permissions are more complex than the 3-level, 3-value Unix-style <code>rw-r--r--</code> conventions. 

Windows servers have a user called <code>IUSR</code>, which corresponds to the <code>apache</code> user on many Linux systems. PHP scripts run under the IUSR account.
(For IIS 7.5, this may be the group WEB\Users)

====Levels====
A directory or file does have an <code>owner</code>, and Windows does have <code>group</code>s, but there is no <code>"everyone else"</code> under Windows. 

There is a group called <code>Users</code>. This corresponds to all accounts used by human beings to deliberately interact with the server. But accounts for services, system operations, and software user permisions do not belong to that group, and in fact '''no''' accounts at all (human or otherwise) have '''any''' privileges which aren't explicitly granted either directly to the user or by membership in some group.

====Values====
Beyond <code>Read</code>, <code>Write</code> and <code>Execute</code>, Windows permissions include additional values. The important ones to know about for a Joomla website are <code>Read</code> and <code>Write</code>.

===HowTo configure the permissions===
When logged in to the Windows server, run Windows Explorer, and navigate to inetpub.

Right-click the directory which holds your Joomla site.<br />
Get Properties, tab to Security.<br />
Click ADD.<br />
Make sure that the LOCATION field is set to the local computer, not a domain controller.<br />
Type iis_iusrs into the field for identifying the user/group you are granting access to.<br />
Confirm.<br />
Highlight the iis_iusrs entry in the access control list.<br />
Check the boxes for Read & Execute, List Folder Contents, Read, and Write<br />
Confirm, put the security window away now.<br />
Open Start -. Administrator -> Computer Management.<br />
Navigate to Local Users and Groups -> Groups.<br />
Find or create the group iis_iusrs<br />
Add a member to the group:<br />
again, make sure that the LOCATION field is set to the local computer, not a domain controller.<br />
Type IUSR into the field for identifying the user/group you are granting access to.<br />
Confirm.<br />
Save.<br />

Run the Joomla installer again, and enjoy your PHP user's write privileges in your website folder.