There was a really really old facing game I played before like 10 years ago-ish on the PC a lot and been trying to remember what it was...

I've asked someone else already and they thought it was "Mashed" but I checked that out and definably wasn't it.

What I remember of this game:

Castle-like theme.

Different Gaming Options. (Race, Deathmatch, Team Deathmatch{Red vs blue}, etc).

Speed boosters.

Power ups (Including shields, weapons, nitro-thing)

etc...

I've been trying to remember what this game is for a long time and just can't remember XD. Anybody knows what I'm talking about?

You mean definitely.

What kind of perspective did the game have? Was it top-down, first person, or was the camera positioned behind the vehicle?

I think you can change but I prefer behind the vehicle and always did so.

Was this it?

http://en.wikipedia.org/wiki/Interstate_%2776

No.

It was purely a castle-theme type of thing...