Installing v: 1.6.1

Hi

I have just installed Elgg 1.6.1 on my PC for testing, but I cannot seem to get the installation to complete. I am using WAMP which has Apache 2.2.11, PHP 5.3.0 and MySQL 5.1.36.

I have set up a MySQL Database, and the run the localhost/install.php. It indicates "Now that the Elgg database has been successfully installed", so I then fill in the required details and click on the "Save"button at the bottom.

I then get a 404 not found error. The address is http://localhost/action/systemsettings/install, but looking in my Wamp folders, there isn't a folder called action, but there is one called actions,  so I change the address to http://localhost/actions/systemsettings/install, but I still get a 404 error.

Now there is a file in the systemsettings folder called install.php. Maybe it is trying to load that? So I change the address to http://localhost/action/systemsettings/install.php, and now I get a HTTP 500 Internal Server error.

I guess there will be a really simple answer to this problem, and I would be really gratefull if someone could point me in the right direction.

Thanks in advance

Terry