Ok i looked at your source code from your main page and it looks all messed up every line has a \ right after the code as shown below

<td background=\"themes/DarkBlue/images/barpic3.gif\" width=\"150\" nowrap><font class=\"content\">&&<a href="modules.php?name=Your_Account&op=new_user">C reate an account</font></td>


This i beleve is causeing your site not to show up correctly i am not sure if it is a theme reload or if it is a index.php reupload maybe mikem can help out on explaneing wich one you need. but that looks like the problem i copyed your code to my pc and uploaded to my test server with out the \'s on the lines and it works fine

i am going throught the code a few more times to make sure i have every thing 100% then if you want i will post it for your viewing pleasure