I need some help...

So, I hope someone out here has some answers that I need.

I'm playing a game called "Dracula's Castle," and I've been pretty
stumped on it for the last couple of weeks. I've gone over and over it
from the beginning. I've explored everywhere I can go, I've examined
every area I can, and I've checked over everything. My inventory
includes

Dynamite (used with matches to open the cave)
3 Matches
key (opened door in shack)
bottle of acid (used it on the dungeon)
bucket (used the water on the acid)
sword
cross
paper
crowbar

I've bummed around the castle, I can move the Vampire around, and I can

stun him with the light from the lighthouse. After that, nothing.

I haven't managed to do anything with the crowbar, and I'm pretty sure
there's something I'm supposed to do in the cemetery, but I'll be
hanged if I know what it is. I've read in other hints that there's a
ring somewhere, but I've not managed to find it.

Any help would be appreciated. Thank you!