Permission error in WordPress 2.2.2

I have just started using www.remarpro.com blog (version 2.2.2) since the last few days. However, it seems that every time I would like to delete a post, category or link in my blog, it will give me a message, “You do not have the permission to do so.”.

I’m the only user of the blog, and double confirmed that I’m the administrator of the blog. I’m also very sure that I have full, administrative privilege over my web host. However, it didn’t allow me to delete any post, category or link.

What should I do now to solve the problem?