Restore from backup fails (RTM Ultimate)

I've just done a fresh install of Vista Ultimate RTM -- before which I of
course did a full backup of the original Win XP system. Now I'd like to
restore my data files from the backup, but the restore is failing --
apparently due to security interference.

My backup is done over the network using Ultrabac backup software. I'm
trying to restore a folder that lives at the top level of the C drive. I'm
getting an access denied message.

Suggestions?

TIA,
Bill