check here:
http://support.microsoft.com/?kbid=326549
and here:
http://www.pcbanter.net/t527146.html
WORKAROUND
To work around this issue, use the Attrib command at a command prompt
(Cmd.exe) to view or remove the Read-only or System attributes of folders.
Type attrib /? at the command prompt to view the syntax for the Attrib
command.
Warning If you remove the Read-only or System attribute from a folder, it
may appear as a ordinary folder and some customizations may be lost. For
example, Windows customizes the Fonts folder and provides a special folder
view that permits you to hide variations, such as bold and italic. It also
permits you to change the folder's view settings in ways that are specific
to fonts. If you remove the Read-only and System attributes of the Fonts
folder, these customized view settings are not available. For folders that
you have customized by using the Customize tab of the folder's Properties
dialog box, the folder icon and other other customizations may be lost when
you remove the Read-only attribute.
If a program cannot save files to a folder with the Read-only attribute,
such as My Documents, change the Read-only attribute to System by using the
Attrib command at a command prompt.
For example, to change the Read-only attribute to System for the C:\Test
folder, use the following command:
attrib -r +s c:\test
Note that some programs may not operate correctly with folders that have the
System attribute set. To remove both the Read-only and System attributes
from the C:\Test folder, use the following command:
attrib -r -s c:\test
STATUS
This behavior is by design.
MORE INFORMATION
Windows stores file and folder attributes in the file system with the file
and folder name, extension, date and time stamps, and other information. The
Read-only check box for folders is not available because it does not apply
to the folder. You can use this check box to set the Read-only attribute for
files in the folder. However, you cannot use Windows Explorer to determine
if a folder has the Read-only and System attributes set. To determine the
attributes that are set on a folder, or to change these attributes, you must
use the Attrib command from a command prompt.