My Wordpress site being hack by modifying the .htaccess

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http://serverfault.com – I'm going crazy right now and I don't know what to do. I've did a Google search about those hackers where they using .htaccess to redirect my site to their site to gain traffic, and now I'm getting this problem since yesterday and I don't know what I should do.... I've also did a search and found some people having the same problem and the suggestion was to do a clean install for my site and I have done that. My Wordpress site is to date as well as the plugins. I check my permission all is good. I have check the database everything is okay. Password is changed and they still can do the s (HowTos)