404 Error and Index Line 17 error

I have gone through many questions and answers and attempted to do some things but may have screwed up my blog even more.

I keep having the same problem with different sites so I am apparently not doing something right with Word Press and plugins or something. Of course my Host company says it has nothing to do with the hosting.

Examples: Posts will not show up, put in new images and they will not show up, pages do not refresh, posts become 404 pages for no reason, and I keep getting errors when I try to log in about line 17 in the Index file. Right now I’m able to sign in but get 404 errors when I click on a post…grrrrr!

I attempted to follow some instructions regarding the .htaccess file, but did not really understand what I was suppose to do, so that could be the problem. Then I was lead to a page about the Index.php file, but later realized there is one in my main directory and one in my wp-admin folder.

Regardless, I have redone several sites and am very frustrated. I don’t know if it could be plug ins that I use or if the installations did not go well or what.

Any help would be appreciated. One of my sites is http://www.FancyPrincessDress.net.

Do I have just start over with another new installation?

Help!