Sorry, I'm on PS3, so I can't help you directly. Try contacting one of the threads members. You can find their info in the first post.
What I can, is to give you some tips.
1. Stealth
If you use the Ring of Fog, or the spell Hidden Body you will become invisible. You're not completely invisible, just slightly transparent. Every enemy will still attack you, but they will aggro on you from smaller distance and lose their aggro on you faster. If you combine them with Slumbering Dragoncrest Ring, or Hush your footsteps will become silent. That means enemies won't hear you. With these two, unles you walk strainght in front of a enemy, they will have no idea you're there. It will help you get past Sentinels and Batwing Demons, however those two notorious archers will still fire at you. However, they will do so after you're almost at the end of the narrow bridge, which gives you some fighting chance.
Take note that Hidden Body and Hush are both self buff spells and can't be used together, however the rings can, or combination of ring and a spell.
2. Speed
Not everybody can use spells, but everybody can run.
No matter what build you use, take your best shield and good thrusting, or vertical attacking weapon and make sure to be able to fast roll. That means having less than 25% of your Equip Burden. Go naked if you must. With this, you can run past the enemies. They can kill you if you get unlucky, but don't let a death discourage you. When you get past them and enter the narrow bridge with archers, just sprint straight forward. If you do that their arrows will miss you.
Whatever you do, try not to lock on them and don;t block their arrows, or they will push you from the bridge. It's best to run and if arrows comes at you, roll through it. It sounds harder than it actually is.
Fighting the archers
Whatever way you choose, once you get on the small ledge with the wall in front of you, both archers can attack you. Each from either side. Move to face the archer on your right, the one standing on the corner of the ledge. Don't lock on to him and try to face the wall in front of you. That way, if either of them hits you, you will fall, or get pushed, but remain on the ledge, so you may get damage, but won't fall to your death. You can also roll through their arrows.
When you get close to the wall with the archer, the archer behind you can't hit you anymore, because there is a tower between you two. The archer in front of you switches to sword and shield if you get close enough. You can kill him with powerful spell, or you can kill him with a vertical, or thrusting weapon. Don't use horizontal attacks, because they will bounce off the walls. In the worst case scenario, just keep blocking the knight and moving against him and he will eventually fall down and die. Whatever you do, try to not lock on to him, because you're likely to fall down thanks to pushing, or wacky camera movement. The best way to deal with him is to parry his sword and kill him with a riposte. Or if you prefer, you can actually get past him without fighting, if you lure him a bit backwards, where the ledge is wide enough to go around him.
Other enemies
Sentinels have giant shields that block everything, even things designed to bypass shields. The best way to deal with them is to ignore them and run past them. They will follow you, but they're slow and will lose interest soon. If you want to fight them, it's best to wait for their attacks, roll through them and attack them from their left side (where they have their halberds), or from behind. You can also lure them to attack, back away and kill them with spells, which is a lot easier.
Batwing Demons have long reach with their spears, but they also have 0 Poise, meaning every of your attacks will stop their actions. Use any ranged option you have and they have no chance. Bow, spells, crossbow, heck even Firebombs will do. If you have to fight them by melee, block their first attack and just keep hacking until they die. Just don't defend too long, because their spears do chip damage through your shield thanks to having Lightning element damage in them. If you run away from them, try to move from side to side, because they can throw their spears at you for some big damage. Also, while they have wings, they can't fly, so if they fall off a ledge, they will die. You can actually push most of them to death like this, because they like to hang around edges.
I hope this helps you and really try to contact one of our Xbox members. I'm sure they will gladly help you. Good luck!