files that are copied to windows vista smb share default to beingunreadable

I have two computers - one running Windows XP Pro and the other
running Windows Vista Ultimate. I copy files from the Windows XP
computer to an SMB share on the Windows Vista computer and then try to
open the files only to find that I cannot. When I try, I get an
"Access is denied." error.

I right click on the file, select Properties, click on the Security
tab, then the Advanced button and then on the Owner tab and I see that
I'm the current owner. The only thing is... despite my not being the
current owner, I have no Permissions assigned to me in the Permissions
tab. SYSTEM and "Administrators (compaq\Administrators)" have Full
control permissions, but I, personally, do not.

I go to the parent directory, figuring I'll give myself the
appropriate permissions for all the files contained therein, but the
"Apply these permissions to objects and/or containers within this
container only" is grayed out. So what I am basically forced to do
is, for each file I copy over, I have to manually give myself
permission to access this. Which I think is absolutely dumb.

First, imho, files copied over shouldn't default to an unreadable
status. Second, so long as they are going to do that, I ought to be
able to add permissions en masse.

Any ideas as to what I can do to remedy this behavior?