Unable to Edit or Delete Posts & Pages

Friends Please help me

I recently renewed the wordpress version frin 2.3 to 2.5.

I am unable to delete or edit any post or pages. Whenever I am trying to do so its redirecting me to “Error 404 – Not Found”.

Please help me with this as I am really willing to resolve this issue ASAP.

My Blog – https://blog.watchnshare.in
My Webhost – https://www.ipower.com/ipower/index.bml

Thanks,
Nash