[URGENT] problem after upgrade

Hi, Just update my site from WP2 to WP3.1.2.

My site was setup like this:https://guistyles.com/ show this html site

And after clicking portal it should goes to: https://guistyles.com/index.php and there was WordPress website.

Now there is redirect from https://guistyles.com/index.php to https://guistyles.com/

My .htaccess

order allow,deny
deny from 124.106.189.115
deny from 203.149.116.215
allow from all

Redirect 301 /forum/ https://guistyles.com/index.php

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

And in my blog setup:

WordPress address (URL) : https://guistyles.com
Site address (URL) : https://guistyles.com

I’ve check it backup sql and URL is correct.

Some cache plugins are off for now.

Please help asap