WordPress MU

Well I followed the instructions to install Wordpress MU, but when I click on the "log in" button I get a 404 error. My .htaccess file reads as follows:

RewriteEngine On
RewriteBase /wordpressmu/

#uploaded files
RewriteRule ^(.*/)?files/$ index.php [L]
RewriteCond %{REQUEST_URI} !.*wp-content/plugins.*
RewriteRule ^(.*/)?files/(.*) wp-content/blogs.php?file=$2 [L]

# add a trailing slash to /wp-admin
RewriteCond %{REQUEST_URI} ^.*/wp-admin$
RewriteRule ^(.+)$ $1/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule . - [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-.*) $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]

<IfModule mod_security.c>
<Files async-upload.php>
SecFilterEngine Off
SecFilterScanPOST Off
</Files>
</IfModule>

I have it currently installed on a subdomain, http://mu.asavagebydesign.com
I cannot for the life of me figure out why it is doing this, as when I initially went there it seemed to work fine. It was only after giving it my DB information and attempting to log in that this is happening. The actual error reads:
The requested URL /wordpressmu/wordpressmu/wp-signup.php was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

OK update here... Now the 404 error is gone. But the pages all load up without CSS, and when I attempt to log in, it simply reloads the log in page. I am flabbergasted.

I have it currently installed on a subdomain, http://mu.asavagebydesign.com

Actually you don't. You have your site in an iframe and the files are installed in mu.asavagebydesign.com/wordpressmu/ As noted in the readme file, please install the files within root of where you;re going to run your site from, in this case mu.asavagebydesign.com.

Well that is exactly where I put them. If there is indeed an iframe it was not of my doing. Is there anyway to fix this?

I look at at my directory structure with Filezilla and double check my subdomain setup and everything looks correct. The subdomain points to http://asavagebydesign.com/wordpressmu and the wordpress mu files are all in there. There is no directory called http://mu.asavagebydesign.com/wordpressmu, so I am confused as to why this is occuring.

OK I am on the phone now with GoDaddy. I have this subdomain and the directory structure set up exactly the same as the way I have my normal wordpress set up at http://blog.asavagebydesign.com so I am assuming the issue is on their end.

Well that was productive. They don't know why this is happening either. I am trying a re-install. If the same error keeps occurring (iframe and all) does anyone know why this may be?

OK I give up. There must be something about the way my .htaccess or php.ini or apache or something is set up because all I do is upload the directory containing all of the files and rename the directory so my subdomain points at it. I open it in my browser, fill out the DB information, then click "log in". And every single time it's broken.

OK I fixed it. :-)

So, what was that? :)

Would be good to know. GoDaddy, htaccess or db issue? ;-)

Seems like there is still some problem in it. Its giving me 403 error.