You should update your web.config now. This is the error i am getting on my website whenever i am trying to change the permalinks settings and would show 404 error on all of my pages and posts except home page, u can have a look at gadgets-arena.com. I tried each and everything given on support forums but it just wont work for me. I am using windows hosting from godaddy. I called them but also couldn't help me with this issue.
I am seriously fed up by this thing. PLEASE PLEASE PLEASE help me people i beg you request to solve this problem.
THANK YOU in advance