I loved the 64 games. Because Castlevania 64 is what got me into the series about 7 or 8 years ago, and it gives me somewhat of a nostalgic feeling. Thats only my opinion.
And sorry dude. I haven't played this game in over a year or so, so I can't even remember where that is at(even though I have played the game countless times!).
The only advice I can give you is to go to GameFAQs like hypnocrown said. Check this link out, it's got all the walkthroughs.
http://www.gamefaqs.com/console/n64/game/196882.htmlOr, you can restart your game and go back to your save and try again. I never had this problem whenever I played the game. I haven't played it in a while....and my N64 is getting pretty old. And lately, I've had the urge to play that game again....