[Bloodrun]

okay when you try to register an account, do you get, the warning, "something is very, very wrong, ....etc"?

If so, that means that it is having trouble logging you in.
You need to check to see if your user table in your MySql, matches the amount of fields in your registration.php file.
If they are the same number, make sure that things are in the right spot.
If they are, then you need to check your functions.php page, because the registration.php uses the functions.php to log in.

If you don't know what your looking for, then please paste your functions.php file here so I can take a look at it.