Many folders used by earlier versions of Windows have been moved to a new
location or given a new name in Windows Vista. However, the old folders can
still be seen if you have enabled Show Hidden Files.
Notice they are displayed with a transparent icon and a shortcut symbol.
Although these look like folders, they are actually what is known as a
junction. Junctions behave like shortcuts, but look just like regular
folders.
Their purpose is to silently redirect programs that access them to their
Windows Vista equivalent.
Accessing junctions will give an "Access Denied" error.
You will need to learn what location replaces the location that you are
attempting to access, and use the new location.
You can use the command prompt to do this - browse to the directory that
contains the location that has been moved, and issue the 'dir /al' command -
this will show you all of the junctions in that directory, and the location
that they have been replaced by in brackets.
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- JB
Microsoft MVP - Windows Shell/User
Windows Vista Support Faq
http://www.jimmah.com/vista/