Hello,
I see no reason stressing on the Recycler Folder and Autorun.inf. However, what is important here is the content within the Recycler Folder and the code in the Autorun.inf file.
Understand what is the Recycler folder:
http://support.microsoft.com/kb/171694
The RECYCLER folder is the recycle bin. The recycle bin on your desktop is simply a shortcut to all the RECYCLER folders in your computer. If you have a C:\ D:\ and E:\, your recycle bin shows the contents of C:\RECYCLER D:\RECYCLER and E:\RECYCLER. Having these RECYCLER folders on each drive saves the OS from having to copy a deleted file or folder from any other drive to the C:\ drive.
Removing Recycler folder
Recycler is a read only folder. To view the folder, go to Tools -> Folder Options -> View tab and uncheck the option of Hide Protected operating System Files. Right click on the folder, go to Properties and unselect the option of Read Only. Now it can be deleted.
Recycler Virus
There has been identified a virus with the same name that is Recycler.exe which should not be confused with the Recycler folder.
Understand what is AutoRun.inf
An autorun.inf file is a text file that can be used by the AutoRun and AutoPlay components of Microsoft Windows Operating systems. For the file to be discovered and used by these components, it must be located in the root directory of a volume. As Windows has a case-insensitive view of filenames, the autorun.inf file can be stored as AutoRun.inf or Autorun.INF or any other case combination.
So, The code written inside the Autorun.inf sometimes could be used for triggering another virus file which may be hidden in the machine / network / removable drive.
and that is the major reason we suggest all to Disable the AutoRun Functionality.
Hope that helps!!