Cannot revert (change back) folder permissions settings

Hello,

I've been racking my brain trying to figure this out all day and have come
to a stand-still:

This morning, I was trying to assign permissions to some folders on a
network drive. However, I mistakenly denied permissions to Everyone for that
folder. No biggie, I thought... I'll just set it back to what it was before!

Upon trying to do so, I got this error message:

\\vault\MediaShare\Music\Mixes\Misc is not accessible. You might not have
permission to use this network resource. Contact the administrator of this
server to find out if you have access permisssions. Access is denied.

So, I guess I effectively locked out not only Everyone, but the
administrator, as well? That's silly.

Anyways, I did a ton of investigation to try to figure this out and I tried
a few things:

1. "unlocked" the super Administrator login, which is hidden by Vista as
default
2. tried using the 'takeown' utility to force the permissions to allow admin
3. tried using BPACLer.exe to also force the permissions
4. fiddled around with the Security Properties on the folder

All of the above did not work. I either still kept getting the Access
Denies messages or I was unable to change any of the properties because
options were greyed out.

I am at a complete loss. If anyone can suggest anything, I am open to
anything.

Thank so much in advance.