Converted to NTFS, how to use security options?

I want to block some folders from on my computer from the network. I know how to block it from everyone, and still have the admin. allowed, but that doesn't work. Can someone tell me an easy way to block a folder/file from someone over the network, and only the admin. can access it?

 

bump

 

Well I hate to say deny just yet but do tell more please?
Domain? Workgroup?
Is the drive shared?

 

er.. little lost, but I guess I'll give it a shot.

I didn't mean security options as not allowing guest make folders/files, my brother already messed with that while I was at church and I couldn't access my C: drive, but fixed that.

Yes my drive is shared. I'm networked to my bros computer, crossover, no router involved. I want it so I can get to some folders, but he can't, giving him some kind of security error.

 

Unshare your drive and only share folders you want him to get to.

 

But from what I've read about NTFS, I can share my drive, and block off folders, and that would be a lot easier too.