WP 2.7.1 hacked

Hello, today my WP 2.7.1 was hacked, I immediatly upgraded to 2.8, but too late of course.

Wonder if somebody could help me out.

I found a new e-mail adress under the admin account, so I deleted that and made a new user, with admin roles myself.

All of my content is still there, that’s no problem. I have put my content into pages. Pages have the old content, but when I navigate to pages, they are somehow redirected to the hacker page with a message.

So how can I get wp to redirect to the old pages again, which are still there?

I tried uploading my theme again, but it did not work.
In my .ht access file, i do not see anything strange (but I am not an expert)
Below a copy of my .htaccess

# Created by Redirection Module: Apache
# Mon, 25 May 2009 17:44:34 +0200
# Redirection 2.1.14 – https://urbangiraffe.com/plugins/redirection/

<Files .htaccess,.svn>
order allow,deny
deny from all
</Files>
Options +FollowSymlinks

<IfModule mod_rewrite.c>
</IfModule>

# End of Redirection

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

# END WordPress