Media Player snag.

I am using Media Player 8.00.00.4487, Product ID 55274-OEM-
0015915-64863. This is running on a 2GHz Athlon machine,
OS WinXP Pro. All the windows updates have been
incorporated, with the exception of Media Player 9 (I
don't like it.)

On attempting to open some files in my "Shared Music"
folder, which I have been able to open previously and
when logged on as an Admnistrator, an "Access is denied"
message appears. On selecting "Details, the following
message appears in its own window:

The file is in use
This file is currently in use. Close the file, and then
try to perform the desired action again.

Error ID = 0x80070005, Remedy ID = 0x00000000

The file is not in use by any other program and trying
again doesn't help.

On looking at file properties, the "General" and "Summary"
pages appear correct, but when selecting "Security", the
following message appears:

"You do not have permission to view the current permission
settings for %Filename%, but you can make permission
changes".

Within the "Shared Music" folder, there are sub-folders.
Some of these can be accessed, but on others the following
message appears, when double-clicked:

"C:\Documents and Settings\All Users\Documents\Shared
Music\%Folder name% is not accessible.

Access is denied"

When the cursor passes over these folders, the small
yellow box appears, saying "Folder is Empty". On trying
to delete the folder, the usual prompt asking "Are you
sure that you want to send the folder and its contents to
the recycle bin?" appears. On selecting "Yes" another
window pops up, entitled Error Deleting File or Folder.
This says, after the red cross "Cannot delete %Folder
name%: The directory is not empty.

Microsoft Knowledge base article 234292 suggests that the
filename is being spelled incorrectly. This cannot be the
case as attempts to open the file are being made by double-
clicking on it.

To contact me quickly, can be used.