Hardly anything working, help!!!

I had a bad day…got hacked…spent hours trying to figure out what to do. It ended up that I made a new database, used a semi-recent backup, and “imported” a couple posts from the hacked-up database (would that be a problem?) Now, everything looks fine:

http://little-hypotenuse.com

But if you click any of the archives stuff, the individual entry pages, or any of that Pages….they don’t work!
I get a message like this:

The requested URL /2006/12/ was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

I can’t take this anymore! I seriously cannot figure out what I did wrong to make everything not work…please, any ideas? Someone?