Vista - File and Folder Security Changes

When I upgraded to Windows Vista Ultimate from XP Media Center the new
upgrade changed folder and file security permissions on everything and now i
have to go in and change them individually and this is a TON of files and
folders for a website I run. Is there a way to change the security on
everything at once?

The biggest problem is that some of the files actually have no security set
so if i do a batch security change on a folder some of the information will
not change on the files underneath it because there is no security at all
set, which causes TONS of errors as I am trying to update the folder and
files.

Thanks for any advice.