Pretty Permalinks not working.

I have recently installed wordpress and the default permalinks work fine. I imported posts from by blogger blog. Now,if I change the permalink option to anything other than the default and try to view the post, i go to the right url but there is only side bar in that page and no post structure at all.

My blog http://top10point1.com
permalink of a post http://top10point1.com/2011/05/top-101-nasty-spelling-mistakes-on_24-2/
default link of the same post http://top10point1.com/post-detail/?pkd=534

I am not sure what to do.