Problem: I Can't Fix My Site

Hey guys and girls,

Basically, this is what happened. I added a security patch to the original site, but obviously didn't do it correctly as the whole thing went down and then had to reinstall a backup once I got rid of the altered files. I'm now having loads of problems getting the site to run correctly.

 For some reason, when people try to comment on blogs or in forums, they are redirected back to the index page, rather than being able to leave a post for others. Also, I have problems in that the drop down menu thing isn't working correctly, it's not popping up the hover at all on the homepage and then goes static once you get into the internal pages. My RSS feeds also won't pull, either from the forum section of my site, or from the external site I was relying on to get my feeds that relate to the content of my site. Oh, and finally, the promoblock isn't working. It's just showing one image and it's making the resolution look crappy.

Any idea about what I can do to sort these out? Right now I'm thinking that I'm going to have to uninstall the whole front end (leaving the SQL DB) and then upload it all again from the original. I have the alterations saved, so it won't be too hard to reimplement the aesthetic changes.

Please, if you do have any tips or suggestions, I would be most greatful!

Thanks!