I had a similar problem accept none of the permalinks were working. Post your .htaccess file.
i had a similar issue, this is how i fixed it.
htaccess on root directory:
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress
permalink structure:
/index.php/%postname%/
then i had to make sure that apache has the mod_rewrite module enabled.
running wordpress 2.9.2, apache 2.2.11 and php 5
I guess if I am on a windows server then I need to rewrite these htaccess rules in IIS URL Rewriter, as per…
http://www.iis.net/learn/application-frameworks/install-and-configure-php-applications-on-iis/translate-htaccess-content-to-iis-webconfig
Alternatively, change to an apache server? Is BuddyPress windows compatible?