Vista - deleting vista RC windows folder and program files folder

Hello,

I have a PC with two hard drives configured as basic disks. On one disk I
have an install of Vista Business and on the other I have a old install of a
Vista release canidate. The partition with the Vista RC files now being used
for storage. I have tried to delete the Windows and Program Files folders as
my normal Vista user account, and using the hidden Administrator account.

The dialog box when I try to perform a file operation (delete the folder),
tells me "You need permission to perform this action". The NTFS permissions
for the folders are unavailable so I couldn't take ownership as
Administrator.

Any suggestions please? I would like to reclaim this 15 or so GB's of
storage.


Regards,


Rob Holmes
MCP/MCDST