FILE ACCESS AND DELETE ERRORS

I HAVE A CPU W/ WIN XP-PRO SP2 USED AS A WORKSTATION ON A PEER TO PEER
NETWORK THAT I AM HAVING DIFFICULTY ACCESSING AND DELETING FILES IN A LOCAL
DIRECTORY ON C:\. THE MAIN FOLDER (NAMED: DOWNLOADS FOLDER) HAS SUB-FOLDERS
THAT CONTAIN COPIES OF DOWNLOADED PROGRAM FILES USED FOR INITIAL INSTALLATION
OF PROGRAMS, SUCH AS NERO EXPRESS OR POWER QUEST DRIVE IMAGE. WHEN I TRY TO
ACCESS THE SUB-FOLDERS THE MESSAGE I GET IS "C:\DOWNLOADS FOLDER\NERO OEM
SUITE IS NOT ACCESSIBLE. INCORRECT FUNCTION".
WHEN I ATTEMPT TO DRAG THE SUB-FOLDER TO THE RECYCLE BIN I GET THE MESSAGE:
"CANNOT DELETE NERO OEM SUITE: INVALID MS-DOS FUNCTION".

I HAVE DISABLED SIMPLE FILE SHARING, PERFORMED THE PROCEDURES TO TAKE
OWNERSHIP OF THE FOLDERS AND FILES, ALL TO NO AVAIL. I ALSO DISCONNECTED THE
COMPUTER FROM THE NETWORK CABLE, ALSO WITH NO SUCCESS.

CAN ANYONE HELP ME GET THESE FOLDERS DELETED. I AM TRYING TO SET UP
AUTOMATIC BACKUPS ON THIS COMPUTER AND THEY BACKUP STOPS WHEN IT GETS TO THIS
FOLDER.

THANK YOU IN ADVANCE